House Manderly guards
House Manderly guards are guardsmen in the service of House Manderly of White Harbor. The guards of the New Castle wield silver tridents and their woolen cloaks are blue-green in color. Ser Marlon Manderly, the commander of the castle's garrison, wears silver armor and a Merling King helm.
A Dance with Dragons
Manderly guards escort Lord Davos Seaworth to the Merman's Court to meet Lord Wyman Manderly. Ser Marlon Manderly is ordered to have Davos executed, but there is a secret ploy to spare Davos's life and enlist him for Wyman's cause.