Saint Twrog

It is believed that Twrog was the son of Ithel Hael o Lydaw of Brittany.

There are three other dedications to Saint Twrog: Bodwrog in Anglesey (St Twrog's Church, Bodwrog), Llandwrog near Caernarfon, and the ruin on Chapel Rock near Beachley by the Severn Road Bridge.

When Twrog first arrived in the village now called Maentwrog, the valley was very marshy, which provided him with the wattle that he would have needed to build his cell.

Twrog is reputed to have thrown the stone from the top of Moelwyn crushing a pagan altar in the valley below.

The boulder supposedly hurled by the saint is the one said to mark Pryderi's grave.