The Ty'n-y-rallt estate was in the parish of Betws-yn-Rhos (Betws Abergele), Denbighshire. North Denbighshire Benefit Building Society, active in the late 19th century, owned property in Llysfaen, Caernarfonshire. In 1873, its secretary was Robert Parry.
Abstracts of deeds, copies of wills and burial certificates and other papers relating to the Ty'n-y-rallt estate, 1785-1833; and deeds to properties in Llysfaen, Caernarfonshire, relating to the North Denbighshire Benefit Building Society, 1868-1883.