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.
4 See also
Glywysing is said to be named after Glywys, a real or legendary early
monarch, whose name may continue that of the Romano-British
*Glevenses, the territory and citizens of
Gloucester). According to 12th-century sources, after the death of
Glywys, the kingdom was divided into seven cantrefs named for his
sons: Cydweli, Gwyr, Margam, Penychen, Gwynllwg, Gorfynydd, and
another. These were typically ruled together by the head of the family
and sometimes treated as appenage subkingdoms.
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,
Gwyr (Gower) were
lost to Dyfed. Today the area of
Glywysing is known as Glamorgan.
In the mid 10th century, the kingdom merged with Gwent and changed its
Morgannwg or Gwlad Morgan in honour of King
Morgan the Old (r.
942–74) or his ancestor King Morgan the Generous
(fl. c. 730).
Glywysing seems to have been a sub-kingdom or
principality of the Kingdom of Morgannwg, along with Gwent. After the
death of Morgan the Old, Gwent and
Glywysing were separated again from
974 to 1055, but
Glywysing alone was often referred to as Morgannwg.
Both areas were conquered by
Gruffydd ap Llywelyn
Gruffydd ap Llywelyn in about 1055, but
on his death in 1063, Morgannwg, the union between Gwent and
Glywysing, was reconstituted. How this occurred is unclear; possibly
Kings of Glywysing
Kings of Glywysing were also Kings of
Morgannwg and the Kings of
Gwent were semi-independent under-Kings. The last native ruler of
these areas was Iestyn ap Gwrgan, King of
Morgannwg (1081-1090), who
was deposed by Robert Fitzhamon.
Morgannwg is still used in
Wales for the former county of
Glamorgan (itself a corruption of the term Gwlad Morgan) and its
Kings of Glywysing
^ The three cantrefs composing
Glywysing were based at Allt Wynllyw on
Stow Hill (modern Newport); Nant Pawl; and Llaniltud Fawr. These were
sometimes independent and sometimes controlled one another. Cf. The
History Files: "Celtic Kingdoms of the British Isles: Cernyw /
Glywyssing" (Accessed 14 Feb 2013).
^ Koch, John T. Celtic culture: a historical encyclopedia ABC-CLIO Ltd
(15 Mar 2006) ISBN 978-1-85109-440-0 p.1312
^ Carver, Martin The cross goes north: processes of conversion in
northern Europe, AD 300-1300 Boydell Press; New edition (26 Jan 2006)
ISBN 978-1-84383-125-9 p.125
^ Lloyd, John E. A History of
Wales from the Earliest Times to the
Edwardian Conquest, Vol. 1, p. 274. Longmans, Green, & Co.
(London), 1911. Accessed 22 Feb 2013.
Medieval Welsh kingdoms
Region–Rhwng Gwy a Hafren