St. Vergilius of Salzburg, Irish-born Abbot of St. Peter's monastery at Salzburg. He held that the earth was round, for which St. Boniface accused him of heresy. Vergilius freed himself of the charge, and went on to become a missionary, dying in 789. His name is also sometimes given as Virgilius, Fergal, Ferghil, or Feirghil.

Biography of St. Virgil of Salzburg, also called St. Feargal or Fearghal.

Short biography of St. Virgilius, known to his Irish contemporaries as "the Geometer." From the book by Clifford Stevens.

Short biography of St. Vergil of Salzburg, one of the most learned men of his time. By Karen Rae Keck.