YSCIR-VECHAN (ESGAIR-FECHAN), a hamlet, in the parish and hundred of MERTHYR-CYNOG, county of BRECKNOCK, SOUTH WALES, 9 miles (N. W. by N.) from Brecknock; containing 282 inhabitants. The lesser branch of the Yscir, from which the hamlet takes its name, flows through a vale here, and the surrounding country is composed of barren and mountainous commons. The rateable annual value is returned at £1006.