Pontrobert is an ecclesiastical parish that was formed in September 1854. It comprises the townships of Teirtref and part of Nantymerchiard in the parish Meifod, a portion of Cynhinfa which was in the parish of Llangynyw and portions of the townships of Fachwel, Llaethbwlch and Cadwnfa which were in the parish of Llanfihangel. The total area of this parish is 5,000 acres. As a result of this arrangement, Pont Robert is now divided between the presnt day Community Councils of Meifod, Llangyniew and Mawddwy. Pontrobert was within the historic county of Montgomeryshire, now forming part of Powys. The name Pontrobert is derived from Robert ap Oliver of Cyhinfa, who built the original bridge over the River Vyrnwy around 1700. An alternative Welsh name for Pontrobert is Pont y ddolfeiniog.