John (Bishop of Ardfert) explained

John was an Irish priest in the Diocese of Ardfert and Aghadoe in the 13th-century: he is recorded as Archdeacon of Ardfert in 1664;^[1] and as Bishop of Ardfert and Aghadoe from 1265 until his death in 1286.^[2]

References

1. "Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 1" Cotton, H. pp50 Dublin, Hodges & Smith, 1848-1878
2. Book: Fryde, E. B. . Greenway, D. E. . Porter, S. . Roy, I. . Handbook of British Chronology . Third . Cambridge University Press . Cambridge . 1986 . 0-521-56350-X . 332–334 .