'The Taxation of Pope Nicholas IV (1291) includes the grange of "Pamlond," consisting of one carucate of arable, two mills and rents totalling £4. 2s. 4d. It is described as being in the fee of "Cnoyl" (i.e. Knelston) and in the fee of "Cistremons" at Swansea. It survived till the Dissolution, appearing in the Valor as the grange of "Panylond," worth only 15s. Though no monstic buildings survive on the site, four small square fields defined by banks from 2.5m to 3m wide and from 30cm to 1.3m high, are perhaps a relic of the medieval economy.'
Source: 'Glamorgan Medieval Non-defensive Secular Monuments' by The Royal Commission on Ancient and Historical Monuments in Wales (1982)