Age of Mythology. Literally Age of Empires but you pick between the Greek, Egyptian, and Norse pantheons and then prioritize which specific gods you want to worship for their favor.
I can't think of any other games off the top of my head other than Smite, AoM, and the latest 2 God of War games that mix mythologies.
That explains a lot. I played Grim Dawn and thought that it took a lot of inspiration from Titan Quest, especially the levelling system. Never put 2 and 2 together though.