It is in Wales, United KingdomThe community of Llangattock lies in the south-east corner of the County of Powys, to the south of the River Usk opposite the market town of Crickhowell. It is also within the Brecon Beacons National Park, and is an area of great natural beauty, dominated by the limestone crags of Mynydd Llangatwg. 'Llangattock' is the anglicised version of the Welsh name 'Llangatwg' (Llan - a church or enclosure; Catwg - the patron saint).
Lady Llangattock was born in 1837.
Lady Llangattock died in 1923.
Yes, apparently there is one at Llangattock. For more information see the related link.