House Sunderland

House Sunderland of the Sisters is a noble house from The Sisters of the Vale. House Sunderland blazons their arms with three women's heads, white with black hair, on barry wavy blue and green.

Age of Heroes
House Sunderland's origin is one of the rarer cases of Westeros, as no records can confirm nor deny the stories the Sistermen tell about great Wave-Kings of old. According to legend, the Sisters were raised from the ocean after Sunder 'Fairtide' bedded the Lady of the Waves. Sunder 'Fairtide' was immortalized by the Lady of the Waves as the Lord of the Skies and was worshiped by the Sistermen.

Andal Invasion
During the Andal Invasion, the Sisters were supposedly defended by Gelion the Great, who killed each Andal to step foot on the islands and then took their daughters as concubines. It is said that after a decade, Gelion swore allegiance to the Andals after marrying a warlord's daughter. The last part of the tale is likely true, as no record of a war for the Sisters is mentioned.

Targaryen Era
During Aegon's Conquest, House Sunderland proclaimed Marla 'the Webbed Queen' as the new Wave-Queen and declared independence from the Mountain and Vale. Marla was shortly deposed by her brother Steffon, who bent the knee to the Targaryens.

During the civil war known as the Dance of the Dragons, Jacaerys Velaryon flew on his dragon Vermax to Sisterton on his way to Winterfell, and gained the Sistermen's support.