Glywysing
early medieval petty kingdom in south-east Wales
Glywysing was, from the sub-Roman period to the Early Middle Ages, a petty kingdom in south-east Wales. Its people were descended from the Iron Age tribe of the Silures, and frequently in union with Gwent, merging to form Morgannwg.
Name and early history
Glywysing is said in medieval Welsh tradition to be named after Glywys, supposedly an early king of the region. In reality, the name probably comes from Glevum, the Roman name for what is now Gloucester, via a Latin name *Glevenses ('people of Glevum') or *Glevensis ('person from Glevum'). Thus the name suggests that the kingdom was named after invaders or migrants, or a particular ruler, from Glevum.
According to 12th-century sources, after the death of Glywys, the kingdom was divided into three cantrefs named for his sons: Penychen, Gwynllwg, and Gorfynydd. These were typically ruled together by the head of the family and sometimes treated as appenage subkingdoms.
Location
The borders changed over time, but it is generally thought that its lands originally lay between the Afon Llwyd and either the River Loughor, or the River Neath. At times they expanded eastwards in union with both Gwent and Ergyng. The Gower had either returned or was inherited from Dyfed to Glywysing by 928 prior to the reign of King Morgan the Old.
The public source identifies “Glywysing” as early medieval petty kingdom in south-east Wales. This brief keeps that definition visible, then builds a research path around Glywysing, early and medieval.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 4, 2026. The linked authority identifier is Q2253783. Authority coordinates are 51.500, -3.400. None of the 2 selected statements returned an explicit reference.
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This entry incorporates text from “Glywysing” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.