John Devereux (bishop) explained

John Devereux was a 16th-century religious leader in Ireland.^[1]

He was Dean of Ferns from 1559 to 1569 (the last three years in commendam); and Bishop of Ferns from 1566 until his death in 1578.^[2]

References

1. Handbook of British Chronology By Fryde, E. B;. Greenway, D.E;Porter, S; Roy, I: Cambridge, CUP, 1996, 0713642556
2. "Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 2" Cotton, H. p335 Dublin, Hodges & Smith, 1848-1878