Augusta Ada King, Countess of Lovelace (born Ada Byron on December 10, 1815, and died on November 27, 1852), was an English mathematician and writer. She is best known for her work on Charles Babbage’s proposed mechanical general-purpose computer, called the Analytical Engine. She was the first person to recognize that the machine could be used for purposes beyond simple calculations. Lovelace is often called the first computer programmer.

Lovelace was the only legitimate child of Lord Byron, a famous poet, and Anne Isabella Milbanke, a reformer. Lord Byron left his wife shortly after Ada was born and died when she was eight years old. Though she was often sick as a child, she worked very hard to learn. In 1835, she married William King, who became a Baron and later was named Viscount Ockham and the first Earl of Lovelace in 1838. Ada took the name Lovelace because she was related to the Lovelace family, which had once held a noble title.

Lovelace’s education and social connections helped her meet scientists like Andrew Crosse, Charles Babbage, David Brewster, Charles Wheatstone, and Michael Faraday, as well as author Charles Dickens. She described her way of thinking as "poetical science" and called herself an "Analyst (& Metaphysician)." At 18, her math skills led to a long partnership with Charles Babbage. She became especially interested in his work on the Analytical Engine. She first met Babbage on June 5, 1833, when she and her mother attended one of his Saturday evening gatherings with their mutual friend, Mary Somerville, who was Ada’s tutor.

Although Babbage’s Analytical Engine was never built and did not directly influence the creation of electronic computers, it is now recognized as a machine capable of performing any calculation a modern computer can. Because of this, Babbage is called the "father of computers," and Lovelace is credited with several important early achievements in computing. She translated an article by engineer Luigi Menabrea about the Analytical Engine and added seven detailed notes. These notes described how the machine could calculate Bernoulli numbers, a method often called the first published computer program. Lovelace saw the potential for computers to do more than just math, such as handling music or other types of information. She was the first to suggest that machines could process non-numerical data. Her way of thinking, "poetical science," helped her explore how people and society could use technology together. Ada is remembered in many ways, including through the names of a programming language, roads, buildings, and educational programs. There are also plaques, statues, paintings, and books about her life.

Biography

Lord Byron hoped his child would be a boy but was upset when Lady Byron gave birth to a girl. The girl was named after Byron’s half-sister, Augusta Leigh, and was called "Ada" by Byron. On 16 January 1816, Lady Byron left England with their five-week-old daughter at Byron’s request, going to her parents’ home in Kirkby Mallory. At that time, English law allowed fathers to have full custody of children in cases of separation, but Byron did not try to claim his parental rights. Instead, he asked his sister to keep him updated about Ada’s well-being.

On 21 April 1816, Byron signed a legal agreement to separate from Lady Byron, though he did so reluctantly. He left England shortly after. Lady Byron continued to accuse Byron of immoral behavior for the rest of her life. These events made Ada famous in Victorian society. Ada never had a close relationship with her father, who died in April 1824 when she was eight years old. Her mother was the only parent who cared for her. Ada did not see a family portrait of her father until her 20th birthday.

Ada had a distant relationship with her mother. She was often cared for by her maternal grandmother, Judith, Hon. Lady Milbanke, who loved her. However, because society at the time favored fathers in separations, Lady Byron had to appear as a loving mother to others. She wrote anxious letters to Lady Milbanke about Ada’s well-being, including a note asking Lady Milbanke to keep the letters in case they were needed to prove her concern. In one letter, Lady Byron referred to her daughter as "it": "I talk to it for your satisfaction, not my own, and shall be very glad when you have it under your own." Lady Byron also had Ada watched by friends to ensure she behaved properly. Ada called these people the "Furies" and later said they exaggerated stories about her.

Ada was often sick, starting in childhood. At eight years old, she had headaches that made it hard for her to see. In June 1829, she became paralyzed after a measles infection and was kept in bed for nearly a year, which may have worsened her health. By 1831, she could walk with crutches. Despite her illnesses, she developed skills in math and technology.

In early 1833, Ada had an affair with a tutor. After being caught, she tried to run away with him, but his relatives recognized her and told her mother. Lady Byron and her friends hid the incident to avoid public embarrassment. Ada never met her younger half-sister, Allegra, who was the daughter of Byron and Claire Clairmont. Allegra died in 1822 at age five. Ada did meet Elizabeth Medora Leigh, the daughter of Byron’s half-sister Augusta Leigh, but Medora avoided Ada when they met at court.

Ada became close friends with her tutor, Mary Somerville, who introduced her to Charles Babbage in 1833. She respected Somerville and kept in touch with her for many years. She also knew scientists like Andrew Crosse, Sir David Brewster, Charles Wheatstone, and Michael Faraday, as well as the author Charles Dickens. At 17, Ada was presented at court and became a popular young woman because of her intelligence. By 1834, she was a regular at court events and was described as dainty, though one of Byron’s friends called her "a large, coarse-skinned young woman but with something of my friend’s features, particularly the mouth." Ada disliked this friend, likely because of her mother’s influence, which made her dislike Byron’s friends. However, they later became friends.

On 8 July 1835, Ada married William, 8th Baron King, becoming Lady King. The family had three homes: Ockham Park in Surrey, a Scottish estate on Loch Torridon, and a house in London. They spent their honeymoon at Ashley Combe, a hunting lodge improved by King for their stay. It later became their summer home. From 1845, their main house was Horsley Towers, designed in the Tudor style by the architect of the Houses of Parliament, Charles Barry. Ada later expanded the house herself.

Ada and William had three children: Byron (born 1836), Anne Isabella (called Annabella, born 1837), and Ralph Gordon (born 1839). After Annabella was born, Lady King suffered a long and painful illness that took months to recover from. Ada was a descendant of the extinct Barons Lovelace, and in 1838, her husband was made Earl of Lovelace and Viscount Ockham, making Ada the Countess of Lovelace. In the 1840s, Ada’s mother hired William Benjamin Carpenter to teach Ada’s children and act as a moral guide for Ada. Carpenter fell in love with Ada and encouraged her to express her feelings, claiming he would never act improperly. When Carpenter tried to start an affair, Ada ended it.

In 1841, Ada and Medora Leigh were told by Lady Byron that Ada’s father was also Medora’s father. Ada wrote to her mother: "I am not in the least astonished. In fact, you merely confirm what I have for years and years felt scarcely a doubt about, but should have considered it most improper in me to hint to you that I in any way suspected." Ada blamed Augusta Leigh, not Byron, for the incestuous relationship: "I fear she is more inherently wicked than he ever was." In the 1840s, Ada faced scandals, including rumors of affairs and gambling. She lost over £3,000 on horse races and tried to create a mathematical model for betting in 1851, which failed and left her in debt. She also had a complicated relationship with Andrew Crosse’s son, John. After Ada’s death, John destroyed most of their letters as part of a legal agreement. Ada left him the only heirlooms her father had given her. During her final illness, she worried about John being kept away from her.

From 17, when she was 17, Ada’s math skills began to grow, and math became a major part of her life. Her mother’s fear of the "insanity" she believed Byron had was one reason Ada was taught math early. She studied with teachers like William Frend, William King, and Mary Somerville. In the 1840s, the mathematician Augustus De Morgan helped Ada with advanced math topics, including Bernoulli numbers, which she used to create an algorithm for Babbage’s Analytical Engine. In a letter to Lady Byron, De Morgan praised Ada’s talent.

Work

Ada Lovelace was very interested in science and new ideas during her lifetime. She studied topics like phrenology and mesmerism. After working with Charles Babbage, she continued to explore other projects. In 1844, she wrote to a friend, Woronzow Greig, about her idea to create a mathematical model for how the brain creates thoughts and feelings ("a calculus of the nervous system"). She never completed this work. Her interest in the brain came partly from a long concern she had, passed down from her mother, about her "potential" mental health issues. To learn more about electrical experiments, she visited Andrew Crosse in 1844. That same year, she wrote a review of a paper by Baron Karl von Reichenbach, titled Researches on Magnetism, but it was never published. In 1851, the year before her cancer diagnosis, she wrote to her mother about "certain productions" she was working on about the connection between math and music.

Ada first met Charles Babbage in June 1833 through their mutual friend, Mary Somerville. Later that month, Babbage invited Ada to see a prototype of his difference engine. She became fascinated with the machine and visited Babbage often. Babbage was impressed by Ada’s intelligence and called her "The Enchantress of Number." In 1843, he wrote to her:

In 1840, Babbage was invited to speak about his Analytical Engine at the University of Turin. Luigi Menabrea, a young Italian engineer and future Prime Minister of Italy, wrote a French version of Babbage’s lecture. This was published in Bibliothèque universelle de Genève in October 1842. Babbage’s friend, Charles Wheatstone, asked Ada to translate Menabrea’s paper into English.

From 1842 to 1843, Ada translated Menabrea’s article and added seven notes (A to G) that were three times longer than the translation. The translation and notes were published in Taylor’s Scientific Memoirs in September 1843 under her initials, AAL.

Explaining the Analytical Engine was difficult because many scientists did not understand its purpose, and the British government had shown little interest in it. Ada’s notes even had to clarify how the Analytical Engine was different from the original Difference Engine. Her work was well received; scientist Michael Faraday supported her writing.

Ada and Babbage had a disagreement when the papers were published. Babbage wanted to include an unsigned statement criticizing the government’s treatment of his engine, which could have been mistaken as a joint declaration. When Taylor’s Scientific Memoirs required the statement to be signed, Babbage asked Ada to withdraw the paper. She refused. Historian Benjamin Woolley suggested that Babbage may have involved Ada because of her famous name. Their friendship later recovered, and they continued to write to each other. In August 1851, while dying of cancer, Ada asked Babbage to be her executor, though the letter did not give him legal authority. A part of Worthy Manor’s terrace, called Philosopher’s Walk, was where Ada and Babbage were said to have walked while discussing math.

Ada’s notes are important in the history of computers. Note G described a detailed method for calculating Bernoulli numbers using the Analytical Engine. Though Babbage had written programs for the engine in his personal notes from 1837 to 1840, the algorithm in Note G is often called the first published computer program. The engine was never completed, so the program was never tested.

In 1953, Ada’s notes were republished as an appendix to Faster than Thought: A Symposium on Digital Computing Machines by B. V. Bowden. The engine is now seen as an early model for a computer, and Ada’s notes describe a computer and software.

Because of this work, Ada is often called the first computer programmer, and her method is called the world’s first computer program.

Eugene Eric Kim and biographer Betty Alexandra Toole argued in Scientific American that it was incorrect to call Ada the first computer programmer. Babbage claimed credit for the algorithm in Note G in his autobiography. While Babbage wrote initial programs for the engine, most were never published. Historian Allan G. Bromley noted that Babbage prepared dozens of sample programs between 1837 and 1840, all before Ada’s notes. Dorothy K. Stein said Ada’s notes reflected the mathematical uncertainty of the time, political goals, and social context rather than a clear plan for scientific progress.

In a 1990 article, Allan G. Bromley wrote:

Bruce Collier said Ada helped spread awareness of the Analytical Engine but did not improve its design or theory.

Doron Swade stated that Ada only published the first computer program instead of writing it herself, but he agreed that she was the only person to see the engine’s potential to handle more than numbers.

In his book Idea Makers, Stephen Wolfram defended Ada’s contributions. While acknowledging that Babbage wrote earlier, unpublished algorithms, Wolfram said Ada’s computation of Bernoulli numbers was the most advanced and clear. He argued that Ada was the main force behind her work, even though Babbage helped and commented on it.

In her notes, Ada emphasized the Analytical Engine’s ability to solve complex problems, unlike earlier machines. She saw its potential to do more than just calculations. She wrote:

This idea was important because it showed how computing could be used for more than numbers, a concept realized a century later. Walter Isaacson said Ada’s insight about computing’s versatility came from seeing mechanical looms that used punchcards to create patterns, which reminded her of Babbage’s engine. This idea is seen as significant by historians like Betty Toole, Benjamin Woolley, and programmer John Graham-Cumming, whose project Plan 28 aims to build the first complete Analytical Engine.

According to historian Doron Swade:

Note G also contains Ada’s…

Commemoration

The computer language Ada, developed by the United States Department of Defense, was named after Ada Lovelace. The official guide for the language was approved on December 10, 1980. The Department of Defense’s military standard for Ada, MIL-STD-1815, was numbered after the year of Lovelace’s birth.

In 1981, the Association for Women in Computing started the Ada Lovelace Award. By 1998, the British Computer Society (BCS) began giving the Lovelace Medal. In 2008, BCSWomen started an annual competition for women students. They also sponsor the Lovelace Colloquium, a yearly conference for women undergraduate students. In 2013, the University of Deusto in Spain created the Ada Byron Award for women in technology, later expanding it to several Latin American countries.

Ada, the National College for Digital Skills, is a college in England that teaches digital skills. It has campuses in London (Pimlico) and Manchester (Ancoats). The college offers degree-level apprenticeships and serves students aged 16 to 19.

Ada Lovelace Day is an annual event held on the second Tuesday of October, starting in 2009. Its purpose is to increase awareness of women in science, technology, engineering, and math, and to create role models for girls and women in these fields. Events have included Wikipedia edit-a-thons to improve the representation of women on Wikipedia.

The Ada Initiative was a nonprofit group that aimed to increase women’s participation in free culture and open source projects.

The Engineering Mathematics department at the University of Bristol is named the Ada Lovelace Building. The Engineering in Computer Science and Telecommunications College at Zaragoza University is called the Ada Byron Building. A computer center in Porlock, near where Lovelace lived, is named after her. Ada Lovelace House is a building in Kirkby-in-Ashfield, Nottinghamshire, where Lovelace spent her early years.

In 2012, Google honored Lovelace with a Doodle and blog post on her birthday. In 2013, Ada Developers Academy was founded and named after her. Its goal is to help women and gender-diverse people gain skills to become professional software developers. In 2013, the BBC Radio 4 program Great Lives featured an episode about Lovelace, sponsored by TV presenter Konnie Huq.

Since November 2015, all new British passports include an image of Lovelace and Babbage. In 2017, Google honored Lovelace with a Doodle on International Women’s Day. In 2018, a satellite named after Lovelace was launched by Satellogic. In 2018, The New York Times published an obituary for Lovelace.

In 2018, Senator Ron Wyden proposed a resolution to designate October 9, 2018, as National Ada Lovelace Day to honor her contributions. In 2020, Trinity College Dublin announced plans to add four busts of women, including Lovelace, to its collection. These busts were unveiled in 2023.

In 2022, a statue of Lovelace was placed at the former Ergon House site in London. The statue was created by Etienne and Mary Millner and based on a portrait by Margaret Sarah Carpenter. It was unveiled on International Women’s Day, 2022.

In 2022, Nvidia announced the Ada Lovelace graphics processing unit microarchitecture. In 2023, the Royal Mint released four commemorative £2 coins to honor Lovelace’s contributions.

In 2025, the National Portrait Gallery acquired three known photographs of Lovelace, including two daguerreotypes from around 1843. In 2026, a statue of Lovelace was unveiled at the Hinckley campus of the North Warwickshire and South Leicestershire College.

The bicentenary of Lovelace’s birth was celebrated with events such as:
– Ada Lovelace Bicentenary Lectures on Computability, held by the Israel Institute for Advanced Studies from December 2015 to January 2016.
– Ada Lovelace Symposium at the University of Oxford on October 13–14, 2015.
– Ada.Ada.Ada, a one-woman show about Lovelace, which premiered at the Edinburgh International Science Festival in 2015 and toured internationally.

Special exhibitions were held by the Science Museum in London and the Weston Library in Oxford.

In popular culture

In Romulus Linney's 1977 play Childe Byron, Lovelace is a character. In Tom Stoppard's 1993 play Arcadia, the young genius Thomasina Coverly—inspired by Ada Lovelace—understands chaos theory and discovers the second law of thermodynamics before these ideas are officially recognized. The play also includes Lord Byron.

In the 1990 steampunk novel The Difference Engine by William Gibson and Bruce Sterling, Lovelace gives a lecture about a program using "punched cards" that proves Gödel's incompleteness theorems decades before they are discovered. In Jordan Stratford's steampunk series The Wollstonecraft Detective Agency, Lovelace and Mary Shelley are teenagers and main characters.

In John Crowley's 2005 novel Lord Byron's Novel: The Evening Land, Lovelace appears as an unseen character. Her personality is shown through her notes and efforts to preserve her father's lost novel.

The 2015 play Ada and the Engine by Lauren Gunderson portrays Lovelace and Charles Babbage in a love story. It also imagines a meeting between Lovelace and her father after her death. Sydney Padua's webcomic and graphic novel The Thrilling Adventures of Lovelace and Babbage features Lovelace and Babbage as main characters. The comic includes footnotes about Lovelace's history and uses real letters as dialogue.

Poet Jessy Randall honored Lovelace in her 2025 poetry collection The Path of Most Resistance, which celebrates women scientists.

In the 1997 film Conceiving Ada, a scientist communicates with Lovelace in the past using "undying information waves."

In the 2017 ITV series The Frankenstein Chronicles, Lovelace—named Ada Augusta Byron—is played by Lily Lesser. She works as an "analyst" to operate a life-sized humanoid automaton. The machine's design resembles Babbage's analytical engine. Her job is described as keeping her busy until she returns to studying advanced mathematics.

In the TV show Halt and Catch Fire (2015), a character named Cameron Howe creates an operating system called "Lovelace."

The 2015 documentary Calculating Ada: The Countess of Computing by Dr. Hannah Fry explores Lovelace's life.

In the second season of the ITV series Victoria (2017), Lovelace appears in the episode "The Green-Eyed Monster," played by Emerald Fennell.

In Doctor Who, series 12, episode 2 (Spyfall, Part 2, 2020), Lovelace is portrayed by Sylvie Briggs. The episode also includes characters based on Charles Babbage and Noor Inayat Khan.

• In the board game Ada's Dream (2025), players help Ada complete work on the Analytical Engine.
• A clone of Ada Lovelace appears in the 2023 video game Starfield.
• Ada Lovelace is a playable leader in Sid Meier's Civilization VII.

• Ada Lovelace Day
• A programming language developed by the US Department of Defense is named "Ada."
• The Lovelace Medal is awarded by the British Computer Society (BCS).
• The Lovelace Lectures are hosted by the BCS and the Alan Turing Institute.
• The Lovelace Lectures are also held at Durham University.
• The Ada Lovelace Award is given by the Association for Women in Computing.
• The Ada Initiative, which supports open technology and women, is named after Lovelace.
• The Ada Lovelace Building is an engineering mathematics building at the University of Bristol.
• The Ada Lovelace Building is located in Exeter Science Park.
• The Ada Byron Building is part of the University of Zaragoza's Department of Computer Science and Systems Engineering.
• The Ada Byron Research Centre is at the University of Malaga, Andalucía.
• The Ada Lovelace Institute is a think tank focused on data and AI.
• The Ada Lovelace Center for Digital Humanities is at FU Berlin.
• The ADA Lovelace Centre for Analytics, Data, and Applications is at Fraunhofer IIS.
• The Ada Lovelace Excellence Scholarship is offered by the University of Southampton.
• Adafruit Industries
• The Ada Lovelace Centre is part of the UK government's Science and Technology Facilities Council.
• The Cardano cryptocurrency platform uses "Ada" for its currency and "Lovelace" for its smallest unit.
• "Ada" is an artwork using artificial intelligence at Microsoft's Building 99.
• In 2021, Nvidia's RTX 4000 GPU architecture was named "Ada Lovelace." This was the first Nvidia architecture to use both a first and last name.
• The Ada Byron University Programming Contest is held at the Polytechnic University of Valencia.

• A green plaque is located on Fordhook Avenue, near 5 Station Parade, Uxbridge Road, Ealing.
• Blue plaques are at Mallory Park and St James's Square.
• Ada Lovelace C of E High School in Greenford focuses on music, digital technology, and languages.
• Ada Lovelace House is a council office in Nottinghamshire, later proposed for small businesses.
• The Ada Byron King Building is at Nottingham Trent University.
• The Ada Lovelace Suite is at Seaham Hall.
• The Lovelace Memorial is a Grade II Listed monument in Kirkby Mallory.

Publications

• Lovelace, Ada King. Ada, the Enchantress of Numbers: A Selection from the Letters of Lord Byron's Daughter and her Description of the First Computer. Mill Valley, CA: Strawberry Press, 1992. ISBN 978-0-912647-09-8.
• Menabrea, Luigi Federico; Lovelace, Ada (1843). "Sketch of the Analytical Engine invented by Charles Babbage… with notes by the translator. Translated by Ada Lovelace." In Scientific Memoirs, Vol. 3, edited by Richard Taylor. London: Richard and John E. Taylor. Pages 666–731. This text was saved online on 29 May 2023. A version of this text is also available on Wikisource: The Menebrea article, The notes by Ada Lovelace.

Six copies of the 1843 first edition of Sketch of the Analytical Engine with Ada Lovelace’s "Notes" have been found. Three are kept at Harvard University, one at the University of Oklahoma, and one at the United States Air Force Academy. On 20 July 2018, the sixth copy was sold at an auction to a person whose identity is unknown for £95,000. A digital copy of one version held at Harvard University Library is available online.

In December 2016, a letter written by Ada Lovelace was given to the New York State Department of Taxation and Finance by Martin Shkreli because Shkreli owed money in taxes that he did not pay.