Pinpointing the "1st" programming language is difficult resulting from different definitions. Ada Lovelace's 1843 algorithm for Charles Babbage's Analytical Engine is usually credited, while it wasn't executed on an actual equipment. The first machine-executed languages emerged during the 1940s, with Limited Code (1949) and Plankalkül (1943-1945) being noteworthy early examples. https://blog.hellomybd.com/the-first-programming-language/