Robb Stark, the King in the North, the Young Wolf was the eldest son of Ned Stark, the lord of Winterfell and Warden of the North, and Catelyn Stark. He was killed at a young age at the Red Wedding of House Frey from the hand of Roose Bolton.
Robb Stark left Winterfell at Young age to declare war on King's Landing. He was betrayed by his own men and slaughtered at the Red Wedding on the direction of Tywin Lannister, the Hand of the King Joeffrey.
Robb Stark was believed because of his command, bloodline, and efficient fighting tactics. This made him renowned as the Young Wolf(Wolf was the sign of Emblem in House Stark too).