Llywelyn ap Seisyll King of Gwynedd

Llywelyn ap Seisyll (d.1023), King of Gwynedd and Deheubarth, rose from outside the old royal lines to master most of Wales, and his reign was remembered as a golden moment; the chronicle says that in his time the land was 'replete with abundance of wealth and men'. He beat down a pretender at Abergwaun and died at the height of his power; his son Gruffudd ap Llywelyn briefly ruled all Wales. Our descent runs through his house and its alliance with Powys.