Image of Ada Lovelace
Watercolor portrait of Ada King, Countess of Lovelace, circa 1840, possibly by Alfred Edward Chalon

"Ada saw something that Babbage in some sense failed to see. In Babbage's world his engines were bound by number... What Lovelace saw—what Ada Byron saw—was that number could represent entities other than quantity. So once you had a machine for manipulating numbers, if those numbers represented other things, letters, musical notes, then the machine could manipulate symbols of which number was one instance, according to rules."

-- Babbage specialist Doron Swade

If you have time, you should read more about this incredible woman on her Wikipedia entry.