Saint William was born to noble parents at the beginning of the twelfth century. He was orphaned while still an infant and was raised by relatives. He built a monastery on the summit of Monte Vergine near Naples, and established a community of hermits, to whom he gave a rule inspired in great measure by that of St. Benedict. He died in 1142. According to the 1962 Missal of St. John XXIII the Extraordinary Form of the Roman Rite, today is his feast.