The Greek Mythology Family Tree: A Visual Guide Shows How Zeus, Athena, and the Ancient Gods Are Related

It was long ago that polytheism, as the story comes down to us, gave way to monotheism. Humanity used to have many gods, and now almost every religious believer acknowledges just one — though which god, exactly, does vary. Some popular theories of “big history” hold that, as the scale of a society grows larger, the number of deities proposed by its faiths gets smaller. In that scheme, it makes sense that the growing Roman Empire would eventually adopt Christianity, and also that the gods it first...