Rhyddfedd Frych

Rhyddfedd Frych, sometimes called Rhyddfedd ap Categern, may have been a late 5th-century Welsh ruler. At least one historian has suggested that he may have been the first member of the royal house of Powys to be styled as "Prince".

The name of his father, Categern, has led some scholars to identify him as the son of Cadeyern Fendigaid, and thus brother of Cadell Ddyrnllwg, King of Powys.

Rhyddfedd was succeeded by his son, Cyngen Glodrydd.