On the summit which rose under St. Dewi while he stood on it and preached, now stands St. David's church, at Llandewi Brefi. In the days of its glory--i.e. during nearly the whole period of Roman Catholic rule--it was renowned beyond all others in Britain. To go twice to St. David's was deemed equal to going once to Rome, and a superstitious belief prevailed that every man must go to St. David's once, either alive or dead. William the Conqueror marched through Wales in hostile array in 1080, but arriving at St. David's shrine laid aside the warrior for the votary.