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For a decade from 1536, Clun (or Clunnesland, meaning the whole district of country through which the River Clun passes from its rise on the north western side of the Clun Forest to its fall into the River Teme below Clungunford) formed part of Montgomeryshire.
Maelienydd, sometimes spelt Maeliennydd, was a cantref and lordship in east central Wales covering the area from the River Teme to Radnor Forest and the area around Llandrindod Wells.