Ulysses encountered the island of Circe on his long journey home. This mythical island was ruled by Circe, who possessed magical powers and transformed some of Ulysses's men into swine. The encounters on Circe's island highlight themes of temptation and transformation, as Ulysses must navigate both the allure of Circe’s magic and the necessity of returning home. The island plays a significant role in Ulysses's overall journey, representing a test of his will and resilience.