|Book||A Dance with Dragons (mentioned)|
A Dance with Dragons
Lord Slate sends men south with Robb Stark at the start of the War of the Five Kings. It is unknown if he went with them or not. The banner of House Slate is seen when Roose Bolton gathers the northern forces to Barrow Hall in Barrowton, and Lord Slate attends the wedding of Ramsay Bolton to "Arya Stark" (actually Jeyne Poole) at Winterfell.