Mattin Stepaneos den Balgar is the King of Illian in Robert Jordan's The Wheel of Time fantasy book series. His sign is three leopards, silver on black. He is currently being held at the White Tower and most people in the rest of the world believe him to be dead.
He was defeated in a battle during the Whitecloak Wars and was captured, but eventually ransomed back. Soon after that debacle the Whitecloak Wars ended and Illian won. Following the Forsaken's escape he became the puppet to Sammael. Shortly before Illian was conquered by Rand he was captured by Aes Sedai from the White Tower. After his disappearance his crown was given to Rand al'Thor, the Dragon Reborn.