Part of the 60 ft. curtained wall that surrounds the castle buildings.
After the Norman invasion the Bishops of Chichester made Amberley one of their palaces. Earlier buildings which served as a Manor House were enclosed by a wall in the late 14th Century, intended to safeguard the Bishop from the surrounding peasants. The licence to crenellate......literally, permission to build battlemented walls..... was granted in December 1377, just before the Peasants' Revolt.
Contrary to suggestions, Amberley escaped much of the bloodshed and chaos of the Civil War, although there were several cavalry skirmishes on the nearby South Downs. The then occupant of Amberley Castle, John Goring, was a notorious Royalist and after Parliament's capture of Arundel, soldiers were sent to Amberley to seek payment of back taxes he owed. No doubt it was them who wrecked much of the buildings inside the Castle. Parliament then seized Amberley Castle in 1648 and sold it for £3,341 14s 4d to a London merchant.
It is currently a luxurious hotel.