Catholic Encyclopedia: Saint Donnan
- Three or possibly four Irish saints of this name lived in the sixth and seventh centuries. St. Donnan of Eigg and St. Donnan of Auchterless are probably the same person. There was also a St. Donnan the Deacon, blood brother of St. Kieran of Clonmacnoise;
- http://www.newadvent.org/cathen/05131b.htm

Catholic Encyclopedia: Saint Diarmaid
- Brief biographies of two Irish saints of this name. The first mentioned was Archbishop of Armagh, and died in 851 or 852. The second, St. Diarmaid the Just, was a monastic founder and distinguished writer of the mid-sixth century.
- http://www.newadvent.org/cathen/04775a.htm