In the early 1800s engineer James Watt retired to Doldowlod House, about a mile south of Llanwrthw on the A470 road, when he left Birmingham.
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A commemorative stone, from the precincts of the extinct chapel of Llanwrthwl, was found at Maes Llanwrthwl (Llanwrthwl Field) with a Paulinus Adventvh | MAQVERIGH | FIUIVS.