Dolbadarn Castle ( ; ) is a fortification built by the Welsh prince Llywelyn the Great during the early 13th century, at the base of the Llanberis Pass, in northern Wales. The castle was important both militarily and as a symbol of Llywelyn's power and authority. The castle features a large stone keep, which historian Richard Avent considers "the finest surviving example of a Welsh round tower". In 1284 Dolbadarn was taken by Edward I, who removed some of its timbers to build his new castle at Caernarfon. The castle was used as a manor house for some years, before falling into ruin. In the 18th and 19th century it was a popular destination for painters interested in Sublime and Picturesque landscapes. It is now owned by Cadw and managed as a tourist attraction, and is protected as a grade I listed building. History 1220–40 Dolbadarn Castle was built in either the 1220s or the 1230s by Llywelyn the Great, at the base of the Llanberis Pass, overlooking the lake of Llyn Padarn in northern Wales. Traditionally the Welsh princes had not constructed castles, instead using undefended palaces called , or courts. From the late 11th century onwards, the Normans had advanced into Wales, taking lands in the north and establishing a band of occupied territory in the south called the Welsh Marches. During the 12th century some timber and earthwork castles began to be built, but in small numbers. Llywelyn the Great initially controlled the princedom of Gwynedd, but grew more powerful over the course of his reign, extending his influence over much of Wales during the early years of the 13th century. Llywelyn was faced by several challenges, including dealing with the threat from the kings of England, and maintaining his authority over the native Welsh. As part of this strategy, Llywelyn built Castell y Bere, an innovative stone Welsh castle, in the 1220s. Shortly afterwards he began the first phases of Dolbadarn Castle, constructing the initial stone fortifications on the site, including two square stone towers. The location of the castle was important both because it controlled an important mountain pass, and possibly because Llywelyn claimed authority as the lord of the mountains and coasts of Wales: several of his castles appear to have been located with such political symbolism in mind. It is also possible that Llywelyn may have built his castle on top of the