Old Oswestry Hill Fort in Shropshire, England has been claimed as the Citadel of Atlantis by Henry B. Ambrose in his modestly titled book, I Found Atlantis. However, Ambrose fails to explain how the triremes, described by Plato, sailed up the slopes of the hill-fort from one encircling ‘canal’ to another at different levels without a lock system. Nor does he explain why this hill-fort is still, literally, high and dry while Plato’s Dialogues clearly describe the submergence of Atlantis.
The hill-fort was probably a stronghold of the Celtic Cornovii tribe, dated to around the 6th century BC. In 2008, what has become known as the Pegasus Stone was discovered near the entrance to the fort. The stone has a clearly defined depiction of a horse(a). It is known that there was a horse cult within the Cornovii tribe.