GLYNVACH (GLYNN-VACH), a hamlet, in the parish of LLANIGON, hundred of TALGARTH, county of BRECKNOCK, SOUTH WALES, miles (S. by E.) from Hay, containing 67 inhabitants. This place, the name of which signifies " the little glen," forms the southeastern part of the parish, and comprises a small valley among the Black Mountains of Talgarth, near the spot where the three counties of Brecknock, Hereford, and Monmouth, unite. From the circumstance of its peculiar situation most probably originated that long disputed question respecting the local situation of the chapel in this hamlet, called Capel y fin, or the " chapel of the boundary," which was argued at length in the Ecclesiastical Court, in the year 1708, and was ultimately decided in favour of its being within this parish, to which all the witnesses concurred in stating it to have been originally a chapel of ease, and of which the vicar was accordingly enjoined to perform the duties either in person or by his curate. In the narrow rocky vale which forms the chief portion of the hamlet some corn is grown, but the lands are chiefly devoted to the pasturage of young cattle and sheep. The surrounding scenery is pleasingly varied and in many parts highly picturesque. The living is a perpetual curacy, in the archdeaconry of Brecknock, and diocese of St. David's, endowed with £1000 royal bounty, and £200 parliamentary grant, and in the patronage of the Bishop of St. David's. The chapel has been rebuilt within the last ten years, at the expense of the parishioners, and is appropriately fitted up for the performance of divine service. The hamlet is separately assessed for the support of its own poor, the average annual expenditure for which purpose amounts to £38. 14.