Southwark Cathedral, formally the Cathedral and Collegiate Church of St Saviour and St Mary Overie, is a Church of England cathedral in Southwark, London, near the south bank of the River Thames and close to London Bridge. It is the mother church of the Diocese of Southwark. It has been a place of Christian worship for more than 1,000 years, but the church was not raised to cathedral status until the creation of the diocese of Southwark in 1905.