John Gilbert was a medieval Bishop of Bangor

Bishop of Bangor

The Bishop of Bangor is the Ordinary of the Church in Wales Diocese of Bangor.The diocese covers the counties of Anglesey, most of Caernarfonshire and Merionethshire and a small part of Montgomeryshire...

, Bishop of Hereford

Bishop of Hereford

The Bishop of Hereford is the Ordinary of the Church of England Diocese of Hereford in the Province of Canterbury.The see is in the City of Hereford where the seat is located at the Cathedral Church of Saint Mary and Saint Ethelbert which was founded as a cathedral in 676.The Bishop's residence is...

 and Bishop of St. David's.

Gilbert was nominated to Bangor on 17 March 1372.

Gilbert translated to Hereford on 12 September 1375.

Gilbert was Lord High Treasurer

Lord High Treasurer

The post of Lord High Treasurer or Lord Treasurer was an English government position and has been a British government position since the Act of Union of 1707. A holder of the post would be the third highest ranked Great Officer of State, below the Lord High Chancellor and above the Lord President...

from 1386 to 1389 and then again from late 1389 to 1391.

Gilbert was translated to St. David's on 5 May 1389 and died on 28 July 1397.