Carolus Simplex (17 September 879 – 7 October 929), translated Charles the Simple or the Straightforward, was the King of West Francia from 898 until 922 and the King of Lotharingia from 911 until 923. He was a member of the Carolingian dynasty, and is counted as Charles III of France. Among his accomplishments was the defeat of the Viking chieftain Rollo at the Siege of Chartres in 911. In spite of this victory, Charles realized that he could not keep Rollo out indefinitely and made a treaty with him, establishing the Duchy of Normandy.
The nobles' discontent with Charles' rule led to his overthrow in 923. He spent the rest of his life as a prisoner.
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