Ancient Greek dialects are divided into five main categories: ATTIC, Eolic, Doric, Ionic, and Koine. ATTIC is the dialect of the city-state of Athens, which was the most influential in the development of Ancient Greek literature. Eolic is the dialect of the Aeolian Islands, which was used by Homer in his epic poems. Doric is the dialect of the Dorian tribes, which was spoken in the Peloponnese and other parts of Greece. Ionic is the dialect of the Ionian Islands, which was used in the works of Herodotus and Thucydides. Koine is the common dialect of the Hellenistic period, which was used throughout the Mediterranean world. Finally, Elean is the dialect of the city-state of Elis, which was used in the Olympic Games.