"House Stark of Winterfell is one of the Great Houses of Westeros and the principal noble house of The North; many lesser houses are sworn to them. In days of old they ruled as Kings of Winter; since the Targaryen Conquest they have been Wardens of the North. Their seat, Winterfell, is an ancient castle renowned for its strength. Their sigil is a grey direwolf racing across a field of white, and their words are "Winter Is Coming," one of only a few house mottoes to be a warning rather than a boast." - Courtesy of awoiaf.westeros.org.