 Martin said that due to a large whale population in the Shivering sea, many of the Ibbenses were whalers.The Ibbenses are known to chew whale blubber in order to maintain their metabolism in the cold climate.Several characters see Ibbenese whalers and cogs at the ports of King's Landing, Braavos, Maidenpool, Eastwatch-by-the-Sea, and the Iron Islands.