Regulus is the Saint of the Leo Constellation of the XVIII Century, having fought in the Holy War Against Hades of 1743, as seen in the manga Saint Seiya: The Lost Canvas. A training partner of Unicorn Yato, Regulus quickly stood out among the other Sanctuary Trainees due to his immense Cosmos and talent. Earning his Golden Leo Cloth at the age of 15, Regulus was not only the youngest Gold Saint of his era, but also the strongest by a wide margin, respected by all as an extraordinary prodigy.