The Abbey at Westminster is built upon what was once an island, Thorney Island - a marshy retreat from the City of London. There may have been a Christian church on the Island as early as 604 AD, however the current Abbey was the vision of Edward the Confessor, who died in 1066 shortly after its completion. His intention was to build an eclesiastic-royal complex including a palace with a large monastery and an abbey church suitable for royal functions and burials. William the Conqueror, was crowned here, on December 25, 1066 and the Abbey has been the setting for every coronation (except two) since then. Only the Pyx Chamber and Norman Undercroft are original to the abbey; the Gothic nave and choir were rebuilt in the 13th century. The Abbey is reputed to be haunted by a number of different ghosts. John Bradshaw was the man responsible for signing Charles I's death warrant, and his ghost is said to walk the deanery in shame. A monk who was apparently a murder victim wanders through the cloisters on many evenings, while in 1932 a Benedictine monk was seen floating some distance from the floor, disappearing through a wall opposite the south transept. The ghost of the Unknown Soldier has also been reported there.