Dolwyddelan Highway Rate Books These books give a pretty exact conspectus of the holders of land, tenants of cottages, in the parish of Dolwyddelan, together with estimated rental of each, rateable value etc. With a few exceptions, the whole parish was owned by the Gwydir family, then represented by Clementina Elizabeth, Baroness Willoughby D'eresby who died in 1888. 1876-1877