Adrian of May was a ninth-century Catholic bishop and martyr who lived in ancient Scotland. Some traditions identify him as an Irish monk, possibly known by the Gaelic name Ethernan, who established various hermitages and monasteries on the Isle of May and along the Fife coast. Seeking safety from Viking invaders, he reportedly retreated to the island, where he and his community were eventually killed by marauding Scandinavians around the year 875.