Sugar Loaf, sometimes called The Sugar Loaf ( or ), is a hill situated north-west of Abergavenny in Monmouthshire, Wales and sits within the Brecon Beacons National Park. It is the southernmost of the summit peaks of the Black Mountains, with a height of 1,955 feet (596 metres). Sugar Loaf was gifted to the National Trust by suffragette Lady Rhondda. Name The original Welsh name of the hill appears to have been Mynydd Pen-y-fâl. Translated into English, this name means 'mountain of the head/top of the peak/summit' from mynydd, pen and bâl. The name Sugar Loaf has been popularly applied to numerous hills which have a perceived resemblance to a sugarloaf; the nearest other such hill is the Sugar Loaf, Carmarthenshire. Prehistory A southern foothill of Sugar Loaf, Y Graig, was discovered in the 1990s to be the site of prehistoric flint tools dating from the Mesolithic, Neolithic and Bronze Ages. Geology It is a popular misconception that Sugar Loaf is an 'extinct volcano'; an idea born perhaps from the striking resemblance of its conical outline, particularly when seen from the east, to that of a classic volcano. It is however composed entirely of sedimentary rocks. In common with the rest of the Black Mountains, the hill is formed from Old Red Sandstone which was laid down largely during the early part of the Devonian Period. Its lower slopes (up to around are composed of mudstones and sandstones assigned to the Senni Formation whilst its upper reaches are composed of the more sandstone-rich sequence known as the Brownstones Formation. The very summit of Sugar Loaf is formed from sandstones of the Quartz Conglomerate Group which are of late Devonian age. There are a number of landslips on its flanks which are believed to date from early post-glacial times. The former Usk Valley glacier divided to north and south of it as it travelled eastwards, though the mountain itself is largely free from glacial till. Land use The mountain is in the ownership of the National Trust who manage its grazing by Welsh mountain sheep. The lower slopes are deciduous mixed woodland with fern, heather and bilberry, known locally as whinberry, on the upland slopes. The wooded slopes have been designated a Site of Special Scientific Interest. A vineyard, producing Sugar Loaf wines, is situated at Dummar Farm at the foot of the mountain on south facing slopes near Abergavenny. Walking