What title did Ada Lovelace hold by marriage?

By marriage, Ada Lovelace held the title Countess of Lovelace. She married William King-Noel, then known as Lord King, on 8 July 1835, and initially became Lady King.

The title changed in 1838 when her husband was made the first Earl of Lovelace. Ada therefore became Augusta Ada King, Countess of Lovelace. “Lovelace” was her married title and territorial designation, not her birth surname; she was born Augusta Ada Byron.

Ada and William had three children: Byron, Anne Isabella, and Ralph Gordon. Despite her aristocratic status, Ada is best remembered for her mathematical collaboration with Charles Babbage. Her 1843 notes on Babbage's proposed Analytical Engine included a detailed method for calculating Bernoulli numbers.

The name “Ada Lovelace” became especially prominent in the twentieth century as electronic computing developed. A programming language, Ada, was later named in her honor. Her full formal name is often given as Augusta Ada King, Countess of Lovelace.