Sant Riwari, also known as Saint Riware or Saint Riwall, was a sixth-century priest and aristocrat from the region of Armorica. As a member of the nobility, he is recognized as one of the semi-legendary Breton saints. He is noted for being the first priest to emigrate to the continent, arriving from the British Isles. His presence in the region preceded the establishment of permanent bishoprics and monasteries, which were later founded following his arrival.