Abergwessin, Breconshire Genealogy
LLANFIHANGEL-ABERGWESSIN, a parish in the hundred of Builth, county Brecon, 12 miles N.W. of Builth, its post town, and 13 S.W. of Rhayader. It is situated at the foot of Drugarn Mountain, near the junction of the rivers Gwessin and Irvon. For more information see Llanfihangel Abergwesyn, Breconshire at Genuki.org.uk
Census records from 1841 to 1911 are available online. For access, see England Census Records and Indexes Online. Census records from 1841 to 1891 are also available on film through a Family History Center or at the Family History Library.