Some sources say that gravitational potential was introduced by Lagrange in 1773, and others say that it was introduced by Bernoulli in 1738. I sifted through Daniel Bernoulli's Hydrodynamica (translation by Carmody and Kobus) but could not even find the mention of velocity potential, let alone a potential for Newtonian gravity. I am hoping somebody with more knowledge could clarify this for me. Thanks a lot.