Rev. Alban Butler (171173). Volume IX: September. The Lives of the Saints. 1866.
St. Rusticus, or Rotiri, Bishop of Auvergne
UPON the death of St. Venerand, bishop of Auvergne, which happened the 24th of December, 423, there arose a sharp contest about the choice of a successor; but it is said that God signified his will in an extraordinary manner, in consequence of which the vacant see was conferred on Rusticus, a person remarkable for the sanctity of his manners. He was a native of the diocess, and had the administration of a parish there. This is all that with any certainty is known concerning his life. There were in this age two other bishops of the same name; one of Lyons, and the other of Narbonne. St. Rusticus of Auvergne died about the end of the reign of Valentinian III. He is mentioned on this day in the Roman Martyrology. See St. Greg. of Tours, Hist. l. 3, c. 13, Baillet, &c.