After two young royals become demons and fought each other, they were sealed beneath the castle, and House Grinberryall stood guard over them. House Grinberryall peacefully ruled over the Spade Kingdom until the Zogratis Siblings attacked the king and the royal family. During the attack, a captain of the royal guard carried the royal heir, Yuno, across the neutral zone to a church in Hage of the Clover Kingdom. The Dark Triad then took over as rulers of the Kingdom.
Ralph Niaflem and his family have served the royal family for generations. His father was the captain who carried Yuno to safety.