House Sarsfield of Sarsfield

Sarsfield enters the story of the westerlands during the Andal Invasion, when the Kings of the Rock changed tack: rather than fighting the newcomers to the last man, they began marrying them into their own families.

Out of those unions came the house that rules Sarsfield today, sworn ever since to Casterly Rock.

During the war of the five kings, Arya Stark notices Sarsfield's green arrow among the devices going past as Lord Tywin Lannister rides out of Harrenhal at the head of his host.

It is a brief mention, barely a flash among banners, but it shows that Sarsfield's archers march with the Lannisters.

Later, at the crossroads inn, one of the boys killed by Arya Stark turns out to be a squire in the house's service.

The fact is noted without further detail: neither his name nor the fuller circumstances of the episode are recorded beyond that tie to Sarsfield.

Sarsfield's name surfaces again when Lord Tywin's body is carried back to Casterly Rock: among the western lords and knights escorting the funeral procession rides its banner as well.

Around the same time, Brienne of Tarth notices a soldier wearing Sarsfield's device among Lord Randyll Tarly's men stationed at the gates of Maidenpool.

And when Ser Jaime Lannister gathers troops in King's Landing to march on Riverrun and force its surrender, mounted archers supplied by Sarsfield ride among those forces.