Son of Odysseus and Penelope: a baby when his father left for Troy, a young man by the time he comes back.
The Odyssey opens with him, not with the hero: four books of Telemachus going out to look for news of a father he doesn’t remember. Played by Tom Holland in The Odyssey (film) (2026).
When Athena visits him disguised as a stranger, he welcomes her before asking who she is: Xenia by the book.