Argos was a master craftsman on Iolcus, he created the mechanical wonder-ship Argo, which could run itself and steer to a pre-determined destination. After meeting Argos, Daedalus stopped referring to himself as "the foremost genius in Greece".
After Jason had successfully gathered members of the bloodlines of Ares, Hermes, and Athena, Argos was killed by Skiav, a Blacktongue, in the control room of the ship Argos. Skiav magically teleported there and caught him by surprise, gutting him with a dagger and leaving his body for the Argonauts to find. Although Medea sensed the Blacktongue on the ship, she couldn't do anything because she was sealed within her quarters.