Mochnant (English: Promontory) was a medieval cantref or commote (cwmwd) (sources disagree) in the Kingdom of Powys. In the 12th century it was divided into the commotes of Mochnant Is Rhaeadr (in the north) and Mochnant Uwch Rhaeadr (in the south) (Is signifying 'below' and Uwch 'above' the River Rhaeadr). The name survives in the placename Llanrhaeadr-ym-Mochnant, this village also had the ancient commote's ecclesiastical centre at the church of St Dogfan; ym-Mochant means 'in Mochnant'.