The 12 gods in ancient Greek mythology were Zeus, Hera, Hestia, Demeter, the sons of Zeus, the 12 gods of Olympus (Odysseus, Prometheus, Cleopatra, etc.), Poseidon, and Athena. Each of these gods was in charge of different fields and tasks. For example, Zeus was in charge of the sky and natural phenomena, Hera was in charge of family and women's affairs, Hestia was in charge of justice and war, Demeter was in charge of agriculture and seasonal changes, and so on.