'''Gwallog ap LlaennogLleennog''' (several [[Middle Welsh]] variant orthographies include '''Gwallawc fab Lleynawc''' ; standard [[Welsh language|Welsh]] : ''Gwallog ap Llëenog'' or ''Llëynog'') was a hero of the [[Hen Ogledd]]. He has long been considered a probable sixth-century king of the [[Sub-Roman Britain|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'.<ref>Thomas Owen Clancy (ed.), ''The Triumph Tree; Scotland's Earliest Poetry, AD 550-1350'' (Edinburgh: Canongate, 1998), p. 14.</ref>
