In book 19, how does the guest prove to Penelope that he really knew O. What information does he provide about O.return.

Odysseus tells his story about Krete and says he once hosted Odysseus at Knossos for twelve days before he shipped out again. Penelope cries at the story, then asks for some proof - a description of what Odysseus looked like and who was with him. He provides a somewhat accurate description of Odysseus' clothing, including a cloak and tunic Penelope gave him, and some of his company. Penelope cries again and is won over. She promises to treat him as her guest, though she grieves for Odysseus, who she believes must be dead. Odysseus swears to her Odysseus is alive and preparing to return home, and recalls many of the actual details of his journey.