King Benlli (Welsh: Benlli Gawr) was a probably legendary Brythonic king who ruled part of what is now Wales in the early fifth century, traditionally Powys. He is theorized to have been of, possibly, Irish ancestry.^[1]

Benlli was notorious in early Welsh sources for opposing Saint Germanus and—if he existed—may have been a follower of Pelagianism and thus a heretic in the eyes of Germanus and the Catholic Church.^[2][3] The story of his admonishment by the saint and eventual demise by "fire from heaven" is recorded in the ninth century Historia Brittonum attributed to Nennius, chapters 32-35.^[4] Also according to the Historia he was succeeded by Cadell Ddyrnllwg, formerly one of his servants, who had given shelter to Germanus and his party after Benlli refused to admit them to his stronghold. The hill fort at Foel Fenlli is traditionally considered to have been his castle.^[5]

• Baring-Gould, Sabine (1903). A Book of North Wales. Methuen & Company.
• Bartrum, Peter C. (1993). "Benlli Gawr". A Welsh Classical Dictionary: People in History and Legend Up to about A.D. 1000. Aberystwyth: National Library of Wales. p. 45. ISBN 978-0-907158-73-8.
• Coplestone-Crow, Bruce (1981). "The Dual Nature of the Irish Colonization of Dyfed in the Dark Ages". Studia Celtica. 16. University of Wales Press: 1–24.
• Nennius (1901). "History of the Britains, chapters 32-35". In Giles, John Allen (ed.). Old English Chronicles: Including Ethelwerd's Chronicle, Asser's Life of Alfred, Geoffrey of Monmouth's British History, Gildas, Nennius, Together with the Spurious Chronicle of Richard of Cirencester. London, UK: George Bell & Sons.
• Tolstoy, Nikolai (2012). "Cadell and the Cadelling of Powys". Studia Celtica. 46. University of Wales Press: 59–83.
• Urban, Sylvanus, ed. (November 1789). "Letters on Wales: Lewis Morris to Edward Richard April 22, 1760". The Gentleman's Magazine. LIX Part II (5). London: D. Henry: 984–987.

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