Below the ruined chapel at its summit once lay a hermitage. Here, in the tragic love story of Tristan and Iseult, Ogrin is said to have given the lovers refuge, hiding them from Iseult's husband (and Tristan's uncle) Mark. Others though, have sought refuge here from more terrifying foes.
Famous Cornish 17th-century bad man, the cursed Tregeagle was chased to the Rock by a pack of headless hellhounds. The crooked ex-magistrate had previously been sent to the underworld for his wrongdoings, including robbing an orphan of his estate, but was needed back on Earth when another court case required him as a witness. Tregeagle's ghost promptly appeared and admitted his guilt, effectively saving an innocent man from conviction. The court took pity on his troubled soul, and ordered him to carry out arduous and impossible tasks so his return to Hell would be delayed indefinitely. His first duty was to empty the waters of Dozmary pool using a shell with a hole in it. Understandably tiring of the task, Tregeagle did a runner one stormy night, fleeing to the sanctuary of Roche Rock. Unfortunately, he got wedged in the chapel window and his pursuers, the headless hounds of Hell, got their fangs into Tregeagle and thereafter Tregeagle's screams rang out, terrifying the chapel priest just as much as the priest's praying terrified Tregeagle.
Eventually, the priest saved the beleaguered Hell-dodger and sent him to a beach to make a rope out of sand... ( Something for the kids to do when you visit the beach next time perhaps? )
The visual peculiarities of Roche Rock have continued to exert a hellish fascination even in recent years: some of The Omen – The Final Conflict was filmed here – specifically, the scene in which a group of priests ambush someone whom they believe to be Antichrist Damien Thorne.
The above blurb was acquired (and fiddled with) from this source: Fortean Times.
... and it's ALL true, trust me I know... I was there...