Seat of House Umber and the northernmost great castle of the Seven Kingdoms, save only the strongholds of the Night's Watch. It stands in forest east of the kingsroad and close by the Gift, north of the Last River and west of the Bay of Seals.
Seat of Giants
Last Hearth was the royal seat of the Umbers in the Age of Heroes, when they were petty kings in their own right, and the giant breaking his chains has flown above it ever since. Queen Alysanne Targaryen came down upon it on Silverwing in 58 AC and startled the northern lords with the courtesy of her visit. The great melee held here in 170 AC is remembered for its savagery: eighteen men died in it, and half again that number were maimed.
The Castellan Uncles
When Robb Stark called the banners, the Greatjon and his son took away nearly every fighting man, leaving the castle to the Greatjon's uncles, Mors Crowfood and Hother Whoresbane. After the Red Wedding made the Greatjon a captive of the Freys, the brothers split the house between the claimants rather than see it broken, Hother bending to Roose Bolton while Mors declared for Stannis Baratheon.