Justinian of Ramsey Island was a 6th-century monk and hermit originally from Brittany. After serving as an abbot and confessor to Saint David, he moved to the remote Ramsey Island to lead a more disciplined spiritual community. He was known for his intense asceticism, which included praying for long periods while standing in the cold sea. According to tradition, he was eventually killed by beheading at the hands of those dissatisfied with his strict lifestyle.