Athenian city-states all had their patron diety. According to wikipedia, the Spartans worshipped Apollo and Artemis. This seems counter-intuitive: why did the Spartans, of all peoples, choose the god of arts and sciences rather than the god of war?
Not to discourage any further answers but this answer on the reception of Ares and Athena in ancient Greece /u/Iphikrates is a choice offering.