Dictionary of Welsh Biography

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z

TREVOR , JOHN ( I ) (d. 1357 ), bishop of S. Asaph .

Very little is known about him, and the principal object of this note is to warn the reader against a tendency to mix him up with John Trevor ( II ) . It is quite obvious that he was a ‘climber.’ We first hear of him in 1343 in the papal court at Avignon where he was given permission to hold a canonry at S. Asaph simultaneously with one at Bangor — in addition to which he was, in 1344 , made a prebendary of S. Asaph . On the death of David , bishop of S. Asaph , the pope intended to enthrone an Italian but this was fiercely opposed by the chapter. Accordingly, in 1346 , the diocese was offered to ‘ Griffin de Trevor .’ He declined the appointment which was thereupon offered to his nephew, John Trevor , who was on the spot; he was consecrated at Avignon in June 1346 , and sent over to Wales in July. But according to Le Neve , it was in 1352 and in Rome that the consecration took place; possibly this refers to a second consecration — it should be observed that it was in 1352 that Trevor took his oath of obedience to Canterbury . He d. in 1357 — in. Feb., according to Le Neve , but in the middle of the year, according to Browne Willis . Tradition has it that he built Llangollen bridge; the present bridge is no older than the time of Elizabeth I , but it is quite possible that John Trevor had built an earlier one there.


  • Browne Willis , A Survey of the Cathedral-Church of St. Asaph (1720) ;
  • Le Neve , Fasti Ecclesiae Anglicanae (1854) ;
  • Thomas , A History of the Diocese of St. Asaph , i, 61-2, 216-7.


Emeritus Professor Robert Thomas Jenkins, C.B.E., D.Litt., Ll.D., F.S.A., (1881-1969), Bangor

Published date: 1959