Hywel Dda (Hywel ap Cadell c.880 – 948) king of Deheubarth and ruler of all Wales)
Hywel’s name is associated with the codification of the laws of Medieval Wales, an event traditionally associated with Whitland, Carmarthenshire, and they are commonly known as the Laws of Hywel Dda. None of the extant law manuscripts can be dated to Hywel’s time, but Hywel’s name is mentioned in the prologues and his name continued to be associated with Welsh law which remained in active use throughout Wales until the appointed date of implementation of the Laws in Wales Acts 1535–1542.