 It lies in the cwmwd (in English 'commote') of Glyn Rhondda, a Welsh lordship centred on a motte and bailey castle at the confluence of the Rhondda Fawr and Nant y Clydach (below the town of Tonypandy) and now known as Ynys y Crug.Little of this structure remains, the motte having been largely destroyed by the building of Taff Vale Railway in the 19th century and the Tonypandy by-pass in the 20th century.The land below Cwmparc was subsequently divided into four farms in Tudor times, one of which was called Parc Uchaf (Upper Pank) and another Parc Isaf (Lower Park).