Sir Eider McDuck is mentioned in the story "The Old Castle's Secret" by Carl Barks and later appeared in Don Rosa's Duck Family Tree and The Life and Times of Scrooge McDuck.

Sir Eider was born in Scotland in 880. Later in his life, he became the leader of The Clan McDuck. In 946, the castle was under siege by Anglo-Saxons, raiders who did not care about the treaty that King Edmund I of England and King Malcolm I of Scotland signed in 945. Sir Eider did not supply arrows for his men (because they were expensive) and paid them (collectively) only 30 pieces of copper an hour. His under-paid men abandoned their lord to save their lives, and Sir Eider died fighting the raiders alone.

Sir Eider was buried in the family cemetery, and his armor was placed in one of the castle's hallways.

This page uses content from the English Wikipedia. The article or pieces of the original article was at Clan McDuck#Sir Eider McDuck. The list of authors can be seen in the page history. As with Disney Wiki, the text of Wikipedia is available under the GNU Free Documentation License.