The Borough Compter was a small compter or prison initially located in Southwark High Street but moved to nearby Tooley Street in the 17th century, where it stood until demolished until 1855. It took its name from 'The Borough', a historic name for the Southwark area of London on the south side of the River Thames from the City of London. This replaced a lock-up as part of the City's court house under the jurisdiction of the Lord Mayor and Court of Aldermen of the City, and their High-Bailiff of Southwark. This first court house was converted from the old parish church of St Margaret's. A floor was made across the level of the church's gallery and the windows below that were blocked in, the Court Room being on the first floor.