|Book(s)|| A Dance with Dragons (appears)|
The Winds of Winter (appears)
Arthor is fifty, with a round soft face like his father's, if Arnolf went too fat.
A Dance with Dragons
The Winds of Winter
Stannis has Arthor, his father Arnolf Karstark, and Arnolf's three grandsons brought before him on the pretext of breaking their fast. Upon entering the village's watchtower, Arnolf notices the chained Theon Greyjoy in the corner and realizes that Stannis is aware of his planned treachery. Arthor doesn't realise this, instead commenting on the lack of chairs.
Stannis's knights surround the five Karstarks. Two of Arnolf's grandsons attempt to resist and are badly injured, but Arnolf and Arthor do not put up a fight. Stannis has vowed that all five will die, but whether quickly or by fire will depend on their cooperation.
Magnar of Thenn