Saint Nonnosus (c. 500 – 560 AD), also Nonosius, was a prior at the San Silvestre monastery on Monte Soratte north of Rome and later a monk at Suppentonia, near Civita Castellana.

[2] There, a tombstone carries an early Christian inscription plate that reads: “Here rests the servant of Christ, Nonnosus, deacon, who lived more or less for 103 years.

[2] A fire damaged the cathedral of Freising in 1159, and in 1161, while the foundations of the church were being dug, remains of three people were discovered, identified as the relics of Nonnosus, and two other saints: Alexander and Justin.

[3] Nevertheless, the Freising prince-bishop Johann Franz von Eckher (1696–1727) identified them as belonging to Nonnosus and buried the relics in 1709 with great pomp in the crypt again, and the cathedral became a popular pilgrimage site.

[3] Churches dedicated to Nonnosus stand not only in Molzbichl and St. Peter in Holz, but also in Berg im Drautal, Hermagor, and Sappada (Pladen) in Italy.