Seisyll or Seisyllt is a Welsh male given name. It may refer to: * Kings

Sisillius I Sisillius (''Welsh:'' Saessyllt) was the name of three legendary Kings of the Britons as accounted by Geoffrey of Monmouth: *Sisillius, one of the younger sons of Ebraucus * Sisillius I, successor of King Gurgustius *Sisillius II Sisillius II ...

and II, legendary kings of the Britons *

Seisyll ap Clydog Seisyll ap Clydog was King of Ceredigion in Wales some time in the late 7th or early 8th century. He gave his name to the later kingdom of Seisyllwg, which consisted of Ceredigion plus the region known as Ystrad Tywi; as such he was possibly the ki ...

(late 7th century), a king of Ceredigion * Seisyll ap Rhun (10th century) * Seisyll ap Ednywain or Owain, father of King

Llywelyn Llywelyn, Llewelyn or Llewellyn is a name of Welsh language origins. See Llywelyn (name) for the name's etymology, history and other details. As a surname Arts *Carmen Llywelyn, American actress and photographer * Chris Llewellyn (poet), American ...

of Gwynedd *

Seisyll ap Dyfnwal Seisyll ap Dyfnwal was a 12th-century Welsh people, Welsh Lord of Gwent Uwchcoed (Upper Gwent). Family and estates Seisyll was the son of Dyfnwal ap Caradog ap Ynyr Fychan and his wife, said to have been Joyce daughter of Hamelin de Balun. He wa ...

(12th century), a lord of Upper Gwent * Seisyll Bryffwrch (12th century), a poet * Seisyll ap Rhun Fychan (13th century)

See also