From Vassal

Mythology games are those that often incorporate a thematic narrative that defines how the game world or characters came into existence, specially those related or based on narratives of ancient civilizations of the world.

The storyline in a number of Mythology games usually includes supernatural elements, such as gods, goddesses and demigods, and are sometimes set in a fabled, primordial time, which usually corresponds to a general corpus of folk stories (myths) that used to have some form of religious or sacred nature for the cultures that engendered these stories.