Gwallog ap Llaennog

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Gwallog ap Llaennog (sometimes given as Gwallawc) was a 6th century king of the sub-Roman state of Elmet in the Leeds area of modern Yorkshire.

He joined a group of Brythonic kings, including Urien Rheged, Riderch Hael and Morcant Bulc of Bryneich, in an attempt to drive the Angles of Bernicia from Britain. This endeavour failed after Urien was slain by Llofan Llaf Difo.

Gwallog later made war against Urien's former kingdom of Rheged in concert with Dunod Fawr of the Northern Pennines, attacking Urien's son Elffin.

He is given the epithet Marchawc Trin, meaning "battle horseman".

Gwallog was succeeded by his son Ceretic, the last king of Elmet, who was deposed by St. Edwin of Deira.