All Hallows-by-the-Tower, at one time dedicated jointly to All Hallows and the Virgin Mary and sometimes known as All Hallows Barking, is an ancient Anglican church on Byward Street in the City of London, overlooking the Tower of London.
According to the church website and other sources it is "the oldest church in the City of London" and was founded in AD 675, although recent research has questioned these claims. The church survived the Great Fire of London in 1666, but was badly damaged during the Blitz in World War II. Following extensive reconstruction, it was rededicated in 1957. From 1922 until 1962 the vicar was the Reverend Philip T. B. "Tubby" Clayton, and the church is still the guild church of Toc H, the international Christian organisation that he founded.