- Dermot of Armagh
Bishop of Armagh, Ireland in 834. Renowned for his learning. Driven from his see by the usurper Foraunan in 835, Diarmaid ruled for a year from Connacht, and then returned in 836. In 841 the see was destroyed by Vikings.
- c.852 of natural causes
- Catholic Online
- New Catholic Dictionary
- Book of Saints, by the Monks of Ramsgate
- Our Sunday Visitor’s Encyclopedia of Saints