Geoffrey of Monmouth, in his History of the Kings of Britain (1136), uses the name Samuil Penessil for a legendary pre-Roman king of Britain, preceded by Redechius and succeeded by Pir.
Reference: History of the Kings of Britain 3.19 at Wikisource. Lewis Thorpe's translation for Penguin Classics (p. 105) gives two kings, Samuil followed by Penessil.
https://en.wikipedia.org/wiki/Sawyl_Penuchel
https://fabpedigree.com/s080/f034480.htm
Hij is getrouwd met Perydd mab Sawyl Bwnisel dim mam a enwir.
Zij zijn getrouwd te Brydeinig Celtig.
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