St Magnus Corner at the north end of London Bridge was an important meeting place in mediaeval London, where notices were exhibited, proclamations read out and wrongdoers punished. As it was conveniently close to the River Thames, the church was chosen by the Bishop between the 15th and 17th centuries as a convenient venue for general meetings of the clergy in his diocese. Dr John Young, Bishop of Callipolis (rector of St Magnus 1514–15) pronounced judgement on 16 December 1514 (with the Bishop of London and in the presence of Thomas More, then under-sheriff of London) in the heresy case concerning Richard Hunne. According to the martyrologist John Foxe, a woman was imprisoned in the 'cage' on London Bridge in April 1555 and told to "cool herself there" for refusing to pray at St Magnus for the recently deceased Pope Julius III.