More on Pierre Mauclerc from Infoplease:

• Peter I, duke or count of Brittany - Peter I Peter I (Pierre Mauclerc), d. 1250, duke or count of Brittany (1213–37). The son of ...
• Arthur I - Arthur I Arthur I, 1187–1203?, duke of Brittany (1196–1203?), son of Geoffrey, fourth ...
• Louis IX, king of France - Louis IX Louis IX or Saint Louis,1214–70, king of France (1226–70), son and successor ...

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