Gwallog ap Lleenog

Gwallog ap Lleenog (Old Welsh Guallauc, Middle Welsh Gwallawc; his father's name is spelled variously Lleinauc, Lleynna[u]c, Lleenawc, and Llennawc) was a hero of the Hen Ogledd. He has long been considered a probable sixth-century king of the sub-Roman state of Elmet in the Leeds area of modern Yorkshire, though some more recent scholarship would identify him more tentatively simply as a 'king of an unidentified region in the north'.