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Brian (French: Brien; Latin: Briennius), who defeated a second raid in the southwest of England, launched from Ireland by Harold's sons in 1069. Brian participated in the conquest of England and afterwards held the honor of Richmond, died without issue. He is presumed to have been illegitimate and is recorded as a witness to a document in 1084. He spent the latter part of his life as an invalid in Brittany.
His descendants became the junior branch of the Breton ducal family, which assumed control of the duchy in 1156 under Conan IV of Brittany.