He is said to have been born in England, but little is known of his life before about 1300. He first appeared in Ireland as a Canon of St. Canice's Cathedral, Kilkenny. In 1302 the see of Ossory became vacant and Fitzjohn, who was much loved by the other clergy of the diocese, was the unanimous choice as Bishop of Ossory.
Archbishop of Cashel
In 1317 the Archbishopric of Cashel became vacant, causing a fierce contest between three rival candidates.The Pope refused to promote any of them and chose Fitzjohn; although KIng Edward II had his own candidate he happily accepted the choice of Fitzjohn, whom he knew and respeced. The Archbishop served as Lord Chancellor of Ireland between 1318 and 1320, and briefly as Lord Deputy of Ireland.
As Archbishop he is mainly remembered for overseeing the building of the walls of Cashel town. The archdiocese suffered during the invasion of Edward Bruce and Fitzjohn found himself in severe financial difficulty. In 1320 the King wrote to the Pope asking for the Archbishop to be released from paying certain debts, on account of the invasion : "he has not received the least profits out of his See, but was obliged to run in debt with his neighbours and friends even for necessaries." To assist Fitzjohn the King appointed him Keeper of the Rolls, with an income of £500 a year.
Fitzjohn died on 15 September 1326. O'Flanagan describes him as a man of great influence and power who was revered by clergy and laity alike; he was also reputed to have accumulated great wealth, but this seems unlikely in view of the plea of poverty made to the Pope on his behalf.
- O'Flanagan, J. Roderick The Lives of the Lord Chancellors of Ireland London 2 Volumes 1870
- O'Flanagan Lives of the Chancellors
- Cashel Public Realm Plan January 2008
- Ball F. Elrington The Judges in Ireland 1221-1921 John Murray London 1926
- Lives of the Chancellors