From the longer Wikipedia page 
John Blyth (or John Blythe) was a medieval Bishop of Salisbury.
Blyth was Archdeacon of Richmond from 1485 to 1493 and was Master of the Rolls 5 May 1492-13 February 1494. He was nominated to Salisbury on 13 November 1493 and consecrated on 23 February 1494, . He died on 23 August 1499.
His brother Geoffrey was Bishop of Lichfield and Coventry.