What is "goeznovius"

Goeznovius (died c. 675 according to one account but more probably fl. sixth century.), also known as Goueznou, was a Cornish-born Bishop of Léon in Brittany, who is venerated as a saint in the region around Brest and the diocese of Léon. According to his Legenda he was born in Cornwall and became one of many of his countrymen who moved to the continent in the wake of the Anglo-Saxon invasions and helped found the Brittonic settlement in Armorica that became established as Brittany. His feast day is celebrated on October 25.