The Nine Travellers was the common name given to the stone circle in Boscombe Moor, one of the Three Gorsedds of Prophecy, the Gorsedd of Damnonium. Despite the common name, the number of stones changed between surveys. Three of them were at one time actually alien lifeforms known as Ogri. Cessair of Diplos was turned into one of the stones by the Megara. They were known to have been included in pagan rituals. (TV: The Stones of Blood)