Rodrik Stark is an unseen character in Game of Thrones. He is dead by the time in which the show takes place. He was a King in the North who, according to legend, won Bear Island in a wrestling match and then granted House Mormont lordship over it.
In the books
In A Song of Ice and Fire, King Rodrik Stark's story is the same. Presumably he took Bear Island from the ironborn, who under the rule of Qhored Hoare ruled much of the western coast of Westeros, from Bear Island to the Arbor.
|Lord:||Prince Bran Stark||Heir:||Rickon Stark|
|Title(s):||King in the North · Lord Paramount of the North · Lord of Winterfell|
|Ancestors:||Brandon the Builder · Rodrik Stark · Karlon Stark · Torrhen Stark|
|Current members:||Sansa Stark · Arya Stark · Benjen Stark · Jon Snow|
|Deceased members:||Rickard Stark · Brandon Stark · Lyanna Stark · Eddard Stark · King Robb Stark · Talisa Stark · Catelyn Stark|
|Household:||Ser Rodrik Cassel · Maester Luwin · Jory Cassel · Vayon Poole · Septa Mordane · Theon Greyjoy · Jeyne Poole · Osha · Hodor · Farlen · Old Nan · Mikken · Varly · Heward · Wyl · Tomard · Tommy · Jacks|