Sir Eider McDuck

He was born in Scotland on 880. He later became the leader of The Clan McDuck. He is presumed to be the one who built Dismail Downs. On 946 the castle was under siege by Anglo-Saxons, raiders who didn't care about the treaty that King Edmund I of England and King Malcolm I of Scotland had signed in 945. Sir Eider didn't supply arrows for his men's bows and paid his men with only 30 pieces of copper an hour. His under-paid men decided to abandon the castle and save their lives. Sir Eider died fighting the raiders alone.

His descendants include Sir Quackly McDuck. He was buried in the newly established family cemetery and his armor was placed in one of the castle's hallways.