House Rykker were made Lords of Duskendale after the Defiance of Duskendale and the destruction of House Darklyn. The only member of the house to appear has been Ser Jaremy Rykker, a senior ranger of the Night’s Watch who was made to join it by Lord Tywin Lannister after the Sack of King’s Landing or face beheading. The house is headed by Lord Renfred Rykker. Their castle at Duskendale is known as the Dun Fort.
Ser Jaremy was killed at Castle Black with his own dagger by a wight, the re-animated corpse of the black brother Jafer Flowers, after he had beheaded it with his sword. Four other men were killed by the wight.