Pinpointing the "1st" programming language is hard resulting from varying definitions. Ada Lovelace's 1843 algorithm for Charles Babbage's Analytical Motor is commonly credited, however it wasn't executed on a true device. The 1st machine-executed languages emerged in the forties, with Quick Code (1949) and Plankalkül (1943-1945) becoming notable early examples. https://blog.hellomybd.com/the-first-programming-language/