Upon hearing of the atrocities committed by Ser Gregor Clegane, Lord Eddard Stark, acting as the Hand of the King, orders Lord Beric Dondarrion to take a hundred men, ride to Ser Gregor's keep and execute him for treason and murder. Beric willingly agrees to the task, and Arthur accompanies him as his squire.
Lord Beric is rumored to have been killed in the Battle at the Mummer's Ford. In fact, Beric is actually killed by the Mountain, who drives a lance through his chest. Thoros of Myr unwittingly resurrects him. This event is witnessed by Arthur, which leads him to pledge his eternal faith in R'hllor, the Lord of Light.
|Season Three appearances|
|Valar Dohaeris||Dark Wings, Dark Words||Walk of Punishment||And Now His Watch is Ended||Kissed by Fire|
|The Climb||The Bear and the Maiden Fair||Second Sons||The Rains of Castamere||Mhysa|
|Season Six appearances|
|The Red Woman||Home||Oathbreaker||Book of the Stranger||The Door|
|Blood of My Blood||The Broken Man||No One||Battle of the Bastards||The Winds of Winter|
Behind the scenes
In the books
In the A Song of Ice and Fire novels, there is no mention of Arthur Stark, son of Brandon Stark and Ashara Dayne, though his character is most comparable to Lord Edric Dayne. Ashara was rumored to have given birth to a stillborn daughter.