Sodam Yat is a prophesied future member of the Green Lantern Corps, created by Alan Moore and is first mentioned in "Tygers", a story in Tales of the Green Lantern Corps Annual #2.
Sodam Yat makes his first appearance in regular DC continuity in Green Lantern Corps #12 and part three of the Sinestro Corps War (Green Lantern Corps #14) when Kilowog gathers a group of Lanterns to strike back against Sinestro's forces attack in Space Sector 2263.