John Barnet was a Bishop of Worcester

Bishop of Worcester

The Bishop of Worcester is the Ordinary of the Church of England Diocese of Worcester in the Province of Canterbury, England. He is the head of the Diocese of Worcester in the Province of Canterbury...

 then Bishop of Bath and Wells then finally Bishop of Ely

Bishop of Ely

The Bishop of Ely is the Ordinary of the Church of England Diocese of Ely in the Province of Canterbury. The diocese roughly covers the county of Cambridgeshire , together with a section of north-west Norfolk and has its see in the City of Ely, Cambridgeshire, where the seat is located at the...

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Barnet was selected Bishop of Worcester about 16 December 1361, and consecrated on 20 March 1362. He was translated to the see of Bath about 28 November 1363.

Barnet was selected as 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...

 in February of 1363 and held the office until June of 1369.

Barnet was translated to the see of Ely on 15 December 1366. He died as Bishop of Ely on 8 June 1373.