Rev. Alban Butler (171173). Volume IV: April. The Lives of the Saints. 1866.
St. Serf, or Servanus, Bishop
HE was first bishop and apostle of the isles of Orkney, and disciple of St. Palladius, whose apostolic spirit he inherited. He flourished in the fifth century. See Lesley, l. 4; Hist. Scot. Arnoldus, in Theatro Conversionis Gentium. King, &c.