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Rh Lydford occupies a tongue of land between two ravines, one cleft perpendicularly to a depth of seventy feet, the other steep, but not sheer through rock. The old line of fortifications, much degraded by the plough, may be traced distinctly, nevertheless, across the only portion of the headland by which attack was possible. It is the sort of fortress which goes by the name of cliff castle on the Cornish and Welsh coasts.

That it was a site chosen by the prehistoric population is undoubted. Such a natural fortress could not have been overlooked, and it was held since remote times till the Normans came. Yet, notwithstanding the position being almost impregnable, it was taken, and the town of Lydford was burnt by the Danes in 997 after they had destroyed the Abbey of Tavistock. From Domesday it would appear that at the Conquest Lydford was a walled town. It sent burgesses to Parliament twice in the reign of Edward I.

The church is dedicated to S. Petrock, and at its restoration some remains of the old British church were discovered three feet below the pavement of the present edifice. The slabs that had lain on the floor of the original oratory were taken up and placed within the doorway of the present church; so that the worshippers may stand on the very stones on which their ancestors stood in the sixth century. That into the walls of the reconstructed church most of the stones of the original edifice were incorporated, is more than probable.

There are several Petrock churches round the moor