As King of Ithaka, Odysseus owned a palace on the island. When the Trojan War broke out, Odysseus left the palace to his son's supervision [来源请求] and departed for Troy. During the 10-year-old war, Odysseus became a major player, creating the Trojan Horse which helped the Greeks to win the battle. During his return trip that took ten years, Odysseus experienced numerous adventures, among them defeating the Cyclops Polyphemos, and eluding the monstrous creatures Skylla and Charybdis.
When he finally return to the island, he was received by his swineherd Eumaios, who aided him in slaughtering all the suitors of Penelope. They also slew [来源请求] Odysseus' disloyal goatherd Melanthios, who had mistaken Odysseus for a beggar when he returned, and struck him. While Odysseus had been away at war, Melanthios betrayed him and attempted to impress Penelope's suitors. Odysseus also visited the Cave of the Nymphs after his return. 
While in Ithaka in 431 BCE, the Spartan misthios Kassandra encountered a woman named Odessa, who claimed descent from Odysseus. In addition, she also recovered an armor set that had allegedly belonged to Odysseus, as well as Penelope's Shroud.
- In Greek mythology, Odysseus is credited for inventing the Trojan Horse, thus finally ending the Trojan War.
- He is also the son of Laertes, one of the Argonauts.
- A lieutenant named Odysseus can be recruited aboard the Adrestia via the Helix Store in Assassin's Creed: Odyssey.