Gwallog ap Llênog

Gwallog ap Llênog (Welsh: [ˈɡwaɬɔɡ ap ˈɬeːnɔɡ], Old Welsh: Guallauc map Laenauc) was possibly a sixth-century ruler of Elfed, a region in the wider area memorialised in later Welsh literature as the 'Old North'. The evidence for Gwallog's existence survives entirely from two poems of spurious date and several other references in semi-legendary genealogies and literature well beyond his era. If this later material is to be believed, he was a member of the Coeling, a family which is supposed to have been prominent across several kingdoms in northern Britain in the sixth century. He is probably best remembered for his role in the Historia Brittonum as an ally of Urien Rheged. As with many figures of this period, he attracted much interest in later Medieval Welsh literature.