Once a mighty clan of Vioralf bearing the crest of a lion in the Wars of Corruption. These elves began to revere lions above all other beings some time after the end of the First Age. By the time the Gift of Chaos was given, their adoration had grown to worship.
Lions were seen as sacred, and Sebiloc was revered for his gift. The Ritual of Chaos was adopted by the cult and so they spawned Leomen into the world.