? Dolbadarn Castle is only 6 1/2 miles as the crow flies from the Menai Straits, and yet, the topography of the area is such that it was built by Llywelyn Fawr (Llywelyn the Great) to guard the mountain pass from Caernarfon to the upper Conwy Valley.  ‘Its position at the tip of Llyn Padarn allowed the garrison to blockade anyone’s movement through that part of the north, then as now a main link to the rest of Wales. The military worth of the spot was evidently recognized as early as the 6th century but surviving masonry dates no earlier than the 1200’s.’ http://www.castlewales.com/dolbd.html Llywleyn Fawr built the castle in the early 13th century and it was one of the last defenses of Dafydd ap Gruffydd–Llywleyn Fawr’s grandson–in 1283 after Edward had defeated Llywelyn ap Gruffydd, Dafydd’s brother (Paul Davis, Castles Read more…