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The Lordship of Glamorgan was one of the most powerful and wealthy of the Welsh Marcher Lordships. The seat was Cardiff Castle. It was established by the conquest of Glamorgan from its native Welsh ruler, by the Anglo-Norman nobleman Robert FitzHamon, feudal baron of Gloucester, and his legendary followers the Twelve Knights of Glamorgan. The Anglo-Norman Lord of Glamorgan, like all Marcher lords, ruled his lands directly by his own law: thus he could, amongst other things, declare war, raise taxes, establish courts and markets and build castles as he wished, without reference to the Crown. These privileges were only lost under the Laws in Wales Acts 1535–1542. Though possessing many castles, the main seat of the Lordship was Cardiff Castle.

Lordship of Glamorgan

Arglwyddiaeth Morgannwg
Arms of Gilbert de Clare of Glamorgan
Arms of Gilbert de Clare
Wales (1267–1277)   Lordships of the Marcher barons
Wales (1267–1277)
  Lordships of the Marcher barons
StatusClient state of the Kingdom of England
• 1093–1107
Robert Fitzhamon
• 1217–1230
Gilbert de Clare
• 1509–1536
Henry VIII of England
Historical eraMiddle Ages
• Conquered by Robert Fitzhamon
Preceded by
Succeeded by
Kingdom of Glywysing
Kingdom of England

First CreationEdit

Second CreationEdit

Third CreationEdit

Fourth CreationEdit

Fifth CreationEdit

Sixth CreationEdit

Merged with English CrownEdit


  • R. R. Davies, The Age of Conquest: Wales 1063–1415 (Oxford History of Wales, 2)
  • T. B. Pugh, Glamorgan County History:The Middle Ages: The Marcher Lordships of Glamorgan and Morgannwg and Gower and Kilvey from the Norman Conquest to the Act of Union of England and Wales