Monastic Wales.

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Image of cresset stone, Brecon

The cresset stone seemingly belonged to the priory church at Brecon. Each of the thirty cup-shaped hollows would have held a quantity of tallow and a wick, which were burned to provide light for the monks at Vigils. Cresset stones were also commonly found in the monks' dormitory and at doorways.
The Brecon cresset stone is the only known one of its kind in Wales. It is of native stone, which has laminated in two places, probably as a result of blows.
Source: Brecon Cathedral Heritage Centre.

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Brecon Priory, Powys