List of rulers in Wales

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This is a list of rulers in Wales (Welsh: Cymru; and neighbouring regions) during the Middle Ages, between c. 400s – 1500s. The rulers were monarchs who ruled their respective realms, as well as those who briefly ruled the Principality of Wales. These former territories are now within the boundaries of modern-day Wales and the neighbouring Welsh Marches in England (both in the United Kingdom).

Before the Conquest of Wales, completed in 1282, Wales consisted of several independent realms, the most important being Gwynedd, Powys, Deheubarth (originally Ceredigion, Seisyllwg and Dyfed) and Morgannwg (Glywysing and Gwent). Boundary changes and the custom of dividing patrimonies between heirs meant that few princes ever came close to ruling the whole of Wales.

The names of those known to have ruled over one or more areas are listed below. Boundaries changed frequently. The only person known to have ruled all of Wales as a modern territory was Gruffydd ap Llywelyn (c. 1010–1063), a prince of Gwynedd who became King of Wales from 1055 to 1063. However, some Welsh princes sporadically claimed the medieval title of Prince of Wales between the 13th to 15th centuries. The title remains in use, but is usually given to heir apparents of English and British monarchs.