A manuscript written by Ada Lovelace, who's considered by many to be the first computer programmer, was just sold at auction for more than $125,000, the Guardian reports. A first edition and just one of six known copies of the book, it contains Lovelace's translation of a paper written by Italian mathematician Luigi Menabrea that describes Charles Babbage's plans for his "Analytical Engine" computing machine. The manuscript also contains copious explanatory notes and observations from Lovelace as well as a formula for calculating Bernoulli numbers that has been called the world's first computer program. Lovelace was the daughter of Lord Byron and her interest and aptitude for mathematics led to a years-long friendship and intellectual partnership with inventor Charles Babbage. "Until recently, her story of mathematical excellence was a lesser known one," author Kate Pankhurst told the Guardian.