Who did Telemachus's send to Penelope about his arrival?

Telemachus sent the herald Medon to inform Penelope about his arrival home from his journey to find news of his father, Odysseus. Medon was the town crier and conveyed the message to her, reassuring her that Telemachus was safe. This communication was important as it helped to alleviate Penelope's worries about her son's well-being.