St Mary-at-Hill is an Anglican parish church in the Ward of Billingsgate, City of London. Originally founded in the 12th century, it was damaged in the Great Fire of London in 1666 and only partly rebuilt. It has been much altered since, although some of its medieval fabric survives. Sir Christopher Wren rebuilt the church’s interior and east end, retaining its medieval walls on the other three sides, and the west tower to which he added a lantern. Wren included in his design a Venetian window at the east end, now blocked up, and a pediment, now broken. His interior displays four free-standing Corinthian columns, supporting barrel vaults in a Greek cross pattern, and a coffered central dome. The church is 96 ft long and 60 ft wide. There have been considerable further alterations since the 17th century, including a fire in 1988 that severely damaged the roof and ceiling. Much of the woodwork, including box pews, was unable to be reinstated.