Robb Stark

Robb Stark is a major character in Game of Thrones. He is played by Richard Madden and appears in the first episode.

Robb Stark is the eldest son and heir to Lord Eddard Stark by his wife Catelyn. He has two younger brothers, Bran and Rickon, and two sisters, Sansa and Arya. He is also close to his bastard half-brother, Jon Snow, and to his father's ward, Theon Greyjoy, whom he counts as his best friend outside of the family. He has been trained from a young age to wield a sword and wear armour by Winterfell's master at arms.

In the books
In the Song of Ice and Fire novels Robb Stark is 14 years old when the action begins. He is his father's son, with a keen sense of honour and justice.