Penelope is convinced of Odysseus' true identity because of his knowledge of a special bed in the couple's chamber.
After Odysseus slaughtered the suitors in the hall, Penelope still wants to ensure his true identity. In front of him, she asks nurse Eurycleia to move the bed from the couple's bedroom and spread new blankets.
The bed had been carved by Odysseus from an Olive tree in the room, therefore it couldn't be moved unless it was cut or destroyed. Penelope asked this because only her husband would know about the bed.
The hero reacts with anger, protesting that the bed had been destroyed. In this way, Penelope confirms Odysseus' true identity and the couple finally reunites.
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