The Iliad and the Odyssey, along with the two poems of Hesiod, Theogony and Works and Days, comprised the major foundations of the Greek literary tradition that would continue into the Classical, Hellenistic, and Roman periods. The Iliad is set during the Trojan War, the ten-year siege of the city of Troy by a coalition of Greek kingdoms. It focuses on a quarrel between King Agamemnon and the warrior Achilles lasting a few weeks during the last year of the war. The Odyssey focuses on the ten-year journey home of Odysseus, king of Ithaca, after the fall of Troy. The Theogony is commonly considered Hesiod's earliest work. It concerns the origins of the world (cosmogony) and of the gods (theogony), beginning with Chaos, Gaia, Tartarus and Eros, and shows a special interest in genealogy. The Works and Days is a poem of over 800 lines which revolves around two general truths: labour is the universal lot of Man, but he who is willing to work will get by.