VAVASOR POWELL (1617-1670), Welsh Nonconformist, was by birth a Radnorshire man and was educated at Jesus College, Oxford.
RHAYADER (Rhaiadr-Gwy), a market town of Radnorshire, Wales, situated amid wild and beautiful scenery on the left bank of the Wye, about '1 m.
In April 1647 he was returned for Radnorshire to the House of Commons.
The Wye is the chief river, and forms the boundary between the county and Radnorshire on the north and north-east, from Rhayader to Hay, a distance of upwards of 20 m.; its tributary, the Elan, till it receives the Claerwen, and then the latter river, continue the boundary between the two counties on the north, while the Towy separates the county from Cardigan on the north-west.
- The oldest rocks in Brecknockshire are the Llandeilo shales and intrusive diabases of pre-Llandovery age which near Builth extend across the Wye from Radnorshire; another patch with volcanic outflows comes up at Llanwrtyd, and at both places they give rise to mineral springs.