Sir Stuft McDuck is one of the ancient McDucks and was born in Scotland in 1110
He later became the leader of The Clan McDuck. He was a very successful leader, and the clan became richer under his leadership. When he died in 1175 he was not buried in the family cemetery but rests in his armor, placed in a secret part of Castle McDuck.
Behind his armor is the route to the castle dungeon, which he sealed off. The other entrance to the dungeon is hidden under his tombstone.