iv looks like the cresset stone at Priory Church, Brecon.
"A 'cresset stone' was a flat stone with cup-shaped hollows, each being used to hold a quantity of tallow and a wick, which were burned to produce light." "the Brecon cresset stone is the only one so far known in Wales, and is the finest yet discovered. It is rectangular in form ... It has thirty cups"
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timeasmymeasure
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Date: 2012-01-08 07:18 pm (UTC)"A 'cresset stone' was a flat stone with cup-shaped hollows, each being used to hold a quantity of tallow and a wick, which were burned to produce light."
"the Brecon cresset stone is the only one so far known in Wales, and is the finest yet discovered. It is rectangular in form ... It has thirty cups"
http://www.gtj.org.uk/en/small/item/GTJ23477/