Leo was born during the Crusades, and joined the Holy Orders at a very young age in the fight against the Gears. There he met Ky Kiske, who quickly became his friend. During the war, Leo was tasked to lead the charge to protect the last border of Humanity's strategic point in the Tasmanian Islands. He led the charge into what seemed to be certain death, but his leadership kept his unit alive, and led to the eventual victory of Humanity and Justice's capture. When Illyria was founded, he was elected as Second King. Since then he served as a proud leader and genius strategist, leading Illyria to victory against the Universal Will. He also assisted in Happy Chaos' defeat.
