The Prince Llewellyn quarry was a slate quarry that stands on the west side of the Lledr Valley, ENE of Dolwyddelan. It was worked from around 1820 to 1934.
The quarry opened around 1820, and was originally an open pit. The quarry was expanded in the 1840s. The road from Betws-y-Coed to Dolwyddelan was re-routed in 1846 to allow construction of a new quarry mill and Prince Llewelyn Terrace to house quarry workers. The new mill contained four horizontal sandsaws driven by a steam engine, which was later replaced with a 30 feet waterwheel. An incline led down from the pit to the mill level.
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