I had a need to look in the first-ever probability textbook this weekend. It isn’t really ancient, but it is definitely old. And it’s all on the Internet Archive as a pdf. Good times.
Abraham de Moivre, The doctrine of chances: or, A method of calculating the probabilities of events in play (1756)
Healthy Algorithms 
“Fuller, Clearer, and more Correct than the Former” 🙂
LOL 🙂