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Louis, working with Arnulf, persuaded Otto I, Holy Roman Emperor to attack Richard and Hugh. The combined armies of Otto, Arnulf, and Louis were driven from the gates of Rouen, fleeing to Amiens and being decisively defeated in 947. A period of peace ensued, Louis dying in 954, 13 year old Lothair becoming king. The middle-aged Hugh appointed Richard as guardian of his 15-year-old son, Hugh Capet in 955.