What is "alferius"

Saint Alferius (930–1050) was an Italian abbot and saint. After spending many years as a layman in civil service, in 1002 he was named the head of a delegation from his city to speak with King Henry II of France. Taking ill during the journey, he convalesced at a monastery and vowed to become a monk himself if he recovered. When he did, he became a Benedictine. He subsequently founded the monastery of La Trinità della Cava, located at Cava de' Tirreni.