St. Mary Overy now enters on a new phase of existence. We have seen that it had become a double church, by union with the church, or chapel, of St. Mary Magdalene, the one a conventual, the other a public, place of worship. In the immediate neighbourhood there was a third church, dedicated to St. Margaret, which had been founded by Bishop Giffard in 1107, and granted to the fraternity at St. Mary's by charter of Henry I. By an Act of 1540, the year of Linstede's surrender, the whole were united into a single parish, under the title of St. Saviour's, thenceforward the official designation of the Collegiate Church and surrounding district. The new dedication was suggested by, and intended to perpetuate the memory of, the convent of that name in Bermondsey (founded by Alwin Child, a London citizen, in 1082), which shared the fate of its companions at the Dissolution. Soon after the amalgamation, St. Margaret's Church was secularized, and divided into three portions for use respectively as a Sessions' Court, a Court of Admiralty, and a prison. It stood on the ground where the old Southwark Town Hall was afterwards built, itself a perpetuation of the secular uses to which the deconsecrated church was put before it was destroyed. A relic of St. Margaret's survives in the shape of a monumental slab to Aleyn Ferthing, five times Member for Southwark, about the middle of the fourteenth century. The stone was discovered in 1833 during some excavations on the site of the old church, and transferred to St. Saviour's, where it is imbedded in the pavement of the retro-choir. From 1540 the Priory Church and Rectory were leased to the parishioners by the Crown, at a rental of about L50 per annum, till 1614, when the church was purchased right out from James I for the sum of L800. The Corporation into whose hands the newly constituted parish of St. Saviour's passed in 1540 consisted of thirty vestrymen, of whom six were churchwardens.[5]