Lord Jon Umber, commonly called "the Greatjon" due to his large size, is a recurring character in the first season. He is played by guest star Clive Mantle and debuts in "The Pointy End." The Greatjon is the Lord of Last Hearth and a formidable and proud bannerman of House Stark. He fought for Robb Stark in the War of the Five Kings. He is not present in the second season, as he is leading northern forces fighting in the Riverlands, nor in the third, fourth, or fifth seasons. His role as Robb's chief northern advisor is taken up by Lord Roose Bolton. Despite sometimes standing up against Robb when disagreeing with his decisions, he is fiercely loyal to the Starks of Winterfell, and is in fact the first lord to propose crowning Robb the King of the North.