First King

The First King was a legendary figure from the Dawn Age. According to tradition, he unified the First Men under his rule and led them in their war against the Children of the Forest. At some point in the war he was killed and buried in the North

In the books
In the A Song of Ice and Fire novels, the First King led this people across the Arm of Dorne in their migration from Essos into Westeros. According to folklore his grave is located in the Great Barrow on the outskirts of Barrowton, seat of House Dustin. In The World of Ice and Fire it is revealed that House Dustin, which once ruled the Barrowlands as Barrow Kings, claims descent from the First King himself.