Arthur I was 4th Earl of Richmond and Duke of Brittany between 1196 and 1203. He was the son of Duchess Constance of Brittany, born posthumously to Constance's first husband, Duke Geoffrey II. Through Geoffrey, Arthur was the grandson of King Henry II of England and Duchess Eleanor of Aquitaine, and the nephew of the English kings Richard I and John.
- Occupation
- aristocrat
- Position held
- duke of Brittany, Count of Anjou, Earl of Richmond
- Citizenship
- Duchy of Brittany, Kingdom of England
- Born
- March 29, 1187
- Died
- April 3, 1203
