Waroch I (Breton: Gwereg; modern French: Guérech; d. c. 550) was an early ruler of the Bro Wened[1] (Vannetais) in southern Brittany. It is unclear whether he or his grandson Waroch II is the namesake of the region.
^Anonimo (1832). "Dei conti e duchi di Bretagna". L'Arte di verificare le date dei fatti storici delle inscrizioni delle cronache. Vol. 13 (I ed.). p. 241.