Little is left of that medieval building possibly completed by 1222.
Some masonry remains in the south west corner and a few masonry walls within the present building.
Among the medieval priests to occupy this canonry were Henry Chicheley as Chancellor and later Archbishop of Canterbury, and later Gilbert Kymer, Canon Treasurer, physician to Henry IV, Chancellor of Oxford University and later Dean in 1457 at the canonisation of St. Osmund. Leadenhall was used as a dormitory for the non residential canons after the Reformation, when Queen Elizabeth I ordered the Greater Chapter to meet annually at Whitsun. During the Commonwealth the city allocated the house to the Reverend Faithful Tate, an Irish Presbyterian priest, who was deputed by Parliament to take such services in the cathedral as might be needed. His duties could not have been very onerous as by 1651 he had departed to London where his son Nahum later became a leading playwright and composer of hymns. Leadenhall is, today, late eighteenth century in its architecture.