Thousand Years War

"In those days, the Starks were not the greatest house in the North, and Winterfell was not the greatest castle. Barrowton was the oldest, dating to the First King, and the Starks fought the Barrow Kings for a thousand years."

- Roose Bolton

The Thousand Years War was a conflict between the Kings of Winter of House Stark and the Barrow Kings of the Barrowlands.

In the books
In the A Song of Ice and Fire, singers claim that the so-called Thousand Years War was only two hundred years of conflict spread across several wars rather than a single conflict that lasted a thousand years. It finally ended when the last Barrow King surrendered to Winterfell and gave his daughter to the Stark king for marriage.