RID-Y-BOITHAN (RHID-Y-FYDDIN), a hamlet, in the parish of EGLWYSILAN, hundred of CAERPHILLY, county of GLAMORGAN,
SOUTH WALES, 4 miles (S. E.) from Newbridge; containing 1313 inhabitants, the population having increased above one-half
since the census of 1831. The river Tif forms the western boundary of this hamlet, which takes its name from a ford that
anciently crossed a small stream running into that river, at a place where a bridge now is. The Glamorganshire canal
proceeds along the eastern bank of the Tfif, and the high road from Cardiff to Merthyr-Tydvil pursues its course between
them, and within a few yards of each. The hamlet contains numerous respectable and pleasing residences, many of which are
ornamented with surrounding plantations. The ruins of Castell Coch, supposed to have been erected by a celebrated
chieftain named Ivor Bfich, occupy the brow of a perpendicular rock, near the left bank of the Tfif, at the south-western
extremity of the hamlet, and exhibit, in combination with the well-wooded eminences contiguous, a picturesque and
diversified scene. Another object of interest is the tepid spring called Tars Well, on the banks of the river.