About The Iliad (from Wikipedia):
The Iliad is an epic poem, traditionally attributed to Homer.
Set in the Trojan War, the ten-year siege of Ilium by a coalition of Greek states, it tells of the battles and events during the weeks of a quarrel between King Agamemnon and the warrior Achilles. Although the story covers only a few weeks in the final year of the war, the Iliad mentions or alludes to many of the Greek legends about the siege. Along with the Odyssey, also attributed to Homer, the Iliad is among the oldest extant works of Western literature, and its written version is usually dated to around the eighth century BC.
About The Odyssey (from Wikipedia):
The Odyssey (Greek: Ὀδύσσεια) is one of two major ancient Greek epic poems attributed to Homer. It is, in part, a sequel to the Iliad, the other work traditionally ascribed to Homer. The poem is fundamental to the modern Western canon. Indeed it is the second—the Iliad being the first—extant work of Western literature. It was probably composed near the end of the 8th century BC, somewhere in Ionia, the Greek-speaking coastal region of what is now Turkey.
The poem mainly centers on the Greek hero Odysseus (or Ulysses, as he was known in Roman myths) and his long journey home following the fall of Troy.