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Resources : Wales
Medieval kingdoms and states of Wales
Map of Wales in ca. 1217 - Yellow: Areas directly ruled by Llywelyn; Grey: Areas ruled by Llywelyn's vassels; Green: Anglo-Norman marcher lordships in Wales.
Map of the Principality of Wales after the Statute of Rhuddlan (1284) - Green: Former principality of Gwynedd with counties created by the Statute of Ruddlan; Cyan: Counties created by the Statute of Ruddlan; Orange: Lordships of the Marcher barons.
Cronfa Ddata Enwau Lleoedd / Archif Melville Richards - Online searchable database of the place names of Wales from the University of Wales at Bangor's Place-Name Research Centre. Provides alternate historical spellings, historic references, dates, and most importantly the exact sources in which these place name references are found.
Honours of the Principality of Wales
Castlewales.com - Comprehensive overview of Welsh castles.