Lykas was the Aleph (leader) of Nyssiros tribe on the Saria. Tribe was formed by centaurs and one women Atalanta. Lykas faced destroying attack by satyrs and even worse attacks by Hep'naje. Those attacks cost the tribe many members. Remaining members started to leave the Saria. But Lykas even with wounded leg stayed.
Later when Jason came to this land and saved them from hep'naje and even from one traitorus member of tribe. Lykas then as a desceant of Hermes came with Jason to join him on his journey.