Docon was a Ionian champion who took part in the second tournament in Myceane Arena. He was a blacktongue and was one of the conspirators of killing king Lycomedes. They wanted to claim Myceane for Blactongues.
At the final fight of the tournament when Achilles unexpectedly appeared Docon protested and send himself some men for help him. Jason and Achilles slayed them all including Docon. Meanwhile Patroclus tried to kill Lycomedes in his seat but he dodged and smashed Patroclus's head with mace.
Jason met Docon again at Tartarus where Jason erased him from underworld by killing him there.