The events of the Iliad all take place before The Odyssey. The war at Troy has ended, with the Greeks victorious; the Greeks sack the city.
Technically, the start of the Odyssey starts many years after the war at Troy ends. By this time, most of Odysseus' journey is already over, although we do not yet know of these events.
It is hard to give away more of the events without spoiling the narrative of the story.
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Flashback
Strange Odyssey happened in 1981.
Etrian Odyssey happened in 2007.
At the beginning of the Odyssey, Poseidon is in Ethiopia.That's why Athena brings up Odysseus with Zeus at that point, so that Poseidon can't interfere.
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After 8 and before 10 odyseey 9 is
Flashback
The Odyssey begins at the end of the Trojan War.
Yes, the Odyssey begins ten years after the end of the war, though it also contains the story of what happened to Odysseus during that time.
Robot Odyssey happened in 1984.
Arcus Odyssey happened in 1991.
Lost Odyssey happened in 360.
Strange Odyssey happened in 1981.
Sky Odyssey happened in 2000.
Etrian Odyssey happened in 2007.
The Odyssey begins at the end of the Trojan War.