Original: Robert I ( 15 August 866 â '' 15 June 923 ) , King of Western Francia ( 922 â '' 923 ) , was the younger son of Robert the Strong , count of Anjou , and the brother of Odo , who became king of the Western Franks in 888 .
Simplified: Robert I ( after September 866 -- June 15 , 923 ) , king of West Francia ( 922 -- 923 ) , was the younger son of Robert the Strong , count of Anjou , and the brother of Odo of France .