There may be further evidence of Rǫgnvaldr's Welsh connections. According to several non-contemporary Welsh genealogical tracts, the mother of Llywelyn ap Gruffudd, Prince of Wales was an otherwise unknown daughter of Rǫgnvaldr named Rhanullt. If correct, these sources could indicate that Llywelyn's father, Gruffydd ap Llywelyn Fawr married a daughter of Rǫgnvaldr in about 1220. Contemporary sources, however, show that Llywelyn's mother was Senana, an undoubted wife of Gruffydd. In yet another Welsh pedigree—one compiled by the herald and poet Lewys Dwnn—Rǫgnvaldr is stated have had an otherwise unknown son named Hywel. Although the reliability of such late genealogical sources is suspect, Rǫgnvaldr's known dealings with leading Welsh dynasts could lend weight to the possibility that he had an otherwise unknown Welsh wife or concubine.