Themis/Definition

From Greek mythology, she was the goddess who was the wife of Zeus (the second one; Zeus' first wife was Metis). Her name means right order and her two children were Justice and Peace. Generally gods like Themis didn't participate much in Greek mythology but were part of the creation of the cosmos; while goddesses like Aphrodite and Athena were active participants in events such as the Trojan War, Themis was more seen as a concept rather than a player.

Source: Elizabeth Vandiver's Classical Mythology course.