Glywysing

Glywysing was a post-Roman and early medieval kingdom in South Wales. Its people were decended from the Brythonic tribe of the Silures.

Location

Glywysing is said to be named after Glywys, an early monarch. A derivation from *Glevenses (from Glevum-Gloucester) has also been suggested. Upon the death of Glywys the kingdom was divided into the three cantrefi of Penychen, Gwynllwg and Gorfynydd, though the kingdom of Glwysing still existed. The borders changed over time, but it is generally thought that its lands originally lay between the Afon Llwyd and the River Towy. At times they expanded eastwards to encompass both Gwent and Ergyng, but some time before the early 8th century, Cydweli and Gwyr were lost to Dyfed. In the late 10th century, the kingdom changed its name to Morgannwg or Gwlad Morgan in honour of its king, Morgan Hen. Today the area is known as Glamorgan.