Born in Ireland, Feargal of Virgil (Latin "Virgilius") is said to have been a descendant of Niall of the Nine Hostages.

St Fergal (or Virgil or Feargal) lived first in France and then in Bavaria, where he founded the monastery of Chiemsee. He was appointed bishop of Salzburg around 754 and died in 784 leaving a reputation for learning and holiness. St Fergal (or Virgil) lived first in France and then in Bavaria, where he founded the monastery of Chiemsee. He was appointed bishop of Salzburg around 754.

Many Irish monks set out from Ireland as pilgrims for Christ (peregrini pro Christo). They journeyed widely through Europe and some founded important churches. Among them is St Feargal who was a missionary bishop in Salzburg, Austria. Patrick Duffy records some of the traditions about him.