Nostos ( Ancient Greek: ) is a theme used in Greek literature which includes an epic hero returning home by sea. It is a high level of heroism or greatness. This journey is usually very extensive and includes being shipwrecked in an unknown location and going through certain trials that test the hero. The return isn't just about returning home physically but also about retaining certain statuses and retaining your identity upon arrival. The theme of Nostos is brought to life in Homer's The Odyssey, where the main hero Odysseus tries to return home after battling in the Trojan War. Odysseus is challenged by many temptations, such as the Sirens or the Lotus-eaters. If Odysseus had given into these temptations it would have meant certain death and thus failing to return home. Nostos is used today in many forms of literature and movies.