Jason

Fate/Grand Order: Turas Réalta
Jason is summoned into the Third Singularity along with his fellow Argonauts: Medea, Heracles, and Atalanta. He is convinced by Medea per Solomon's instructions that sacrificing a god to the Ark would give him absolute power. After being told this, Jason ordered the Argonauts to find the Ark and a god to sacrifice.

Fate/Grand Order CMs
Appears in Lostbelt No.5: Atlantis CM.

(Source: TYPE-MOON Wiki)