|The title of this article is conjecture based on information revealed in the A Song of Ice and Fire novels or related material and may be subject to change.
This article includes content relating to the Dance of the Dragons, and therefore contains potential spoilers for House of the Dragon, as revealed in GRRM's writings. Anyone wishing to remain completely spoiler free for the new show should avoid any articles displaying this tag.
In the books
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In the A Song of Ice and Fire novels, Ser Arryk Cargyll was also the twin brother of Ser Erryk, and both were knights in Viserys I's Kingsguard.
When Aegon II Targaryen usurped the throne ahead of his sister Rhaenyra, and was crowned king by Lord Commander Criston Cole himself, it split the realm and the Kingsguard itself: three other Kingsguard sided with Aegon II and Ser Criston, but three others fled to join Rhaenyra's Queensgard. Ser Arryk sided with Aegon II, while Ser Erryk sided with Rhaenyra.
Eventually, Ser Arryk was sent to infiltrate Rhaenyra's base of power at Dragonstone castle, pretending to be his twin brother, but he happened to run into Erryk in a hallway. In the ensuing duel, each brother died at the point of the other's sword. In some ways it was a microcosm of the entire Dance of the Dragons: a destructive civil war that set brother against brother, and for which there was no winner but mutual destruction.