One of Lord Stark’s most loyal bannerman, Galbart Glover is the Lord of Deepwood Motte, located northwest of Winterfell near where the wolfswood meets the sea. Unwed, his brother Robett is his heir and right-hand man.
In the novels, Galbart is never called a lord, and is instead titled the Master of Deepwood Motte. This is normally taken to mean that the Glovers are not in fact lords, but the Northern, old gods-following equivalent of a landed knights. Even so, their prominence in the Stark councils suggests they are a fairly significant house.