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Seisyll 
Summary
Seisyll or Seisyllt is a Welsh male given name. It may refer to:
- Kings Sisillius I and II, legendary kings of the Britons
- Seisyll ap Clydog (late 7th century), a king of Ceredigion
- Seisyll ap Rhun (10th century)
- Seisyll ap Ednywain or Owain, father of King Llywelyn of Gwynedd
- Seisyll ap Dyfnwal (12th century), a lord of Upper Gwent
- Seisyll Bryffwrch (12th century), a poet
- Seisyll ap Rhun Fychan (13th century)
See also edit
- Selyf, a variant of the same name
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