Metamorphoses Book 7: Theseus
Theseus came to Athens and met with King Aegeus, the king not realizing that Theseus was his son. Medea made up an evil potion that would poison him, and as Theseus went to drink, Aegeus recognized his son's royal crest and knocked the cup from his hand. Medea fled, and Aegeus declared a feast day to celebrate Theseus' return. They told stories of the hero's feats and welcomed him to Athens.