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It was Hugh the Abbot who became the regent and guardian for Robert's sons, Odo and Robert, after Robert the Strong was killed at the Battle of Brissarthe in 866.
Robert the Strong had been defending Francia against a joint Breton-Viking raiding party. At some point during the battle, he had removed his armour. At that point, the Vikings launched a surprise attack and Robert was killed in the course of the resulting melee.
As an adult, Odo (or Eudes) would become King of Francia from 888 to 898.