Llywelyn ab Iorwerth the Great
d. 1240
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About
Llywelyn the Great, Prince of Gwynedd, mastered all native Wales for forty years, married King John's daughter, took Shrewsbury, humbled the Marchers, and died in a monk's habit at Aberconwy, the greatest of the Welsh princes.
Research notes
✓ LLYWELYN AB IORWERTH 'the GREAT' (1173-11 Apr 1240), Prince of GWYNEDD, effective ruler of all native Wales; m. Joan, natural dau. of King John (their marriage certain; Gwladus's maternity by her disputed, see her record); father of GWLADUS DDU (our line). A DIRECT ANCESTOR - the second sovereign Welsh ruler in the direct line after Gruffydd ap Llywelyn. Source: the standard Gwynedd royal genealogy (Bartrum/Dictionary of Welsh Biography), web-confirmed 6 Aug 2026; these are the documented medieval Welsh king-lists, generally accepted by historians; contested rungs note-only, not hardened.