Rickard Karstark

Lord Rickard Karstark is a character that appears in A Song of Ice and Fire, and in Game of Thrones, he is Lord of Karhold and also the head of House Karstark. He is an ally of the Starks in the War of the Five Kings.

Game of Thrones
In the TV series, Karstark is portrayed as a secondary antagonist in the Game of Thrones since it was discovered and then executed. Karstark was the House Karstarks. patriac and leader of Karstarks. he is a very present ally to the Starks, he was loyal too. Rickard Karstark was among one of Rob Stark's hosts in Westelands, refuses, and Karstark's son Torrhen Karstark is killed by Jamie Lannister .When Jamie is captured he demands that Jamie be executed for the death of his son, but Catelyn Stark defends him and speaks for his life. Wanting revenge for the death of their two sons, Karstarks and his men kill Martyn and Willen Lannister in the dungeons for retaliation for the death of their children, however this was discovered by Rob, and Rickard along with men who helped him kill the Lannisters, caught and captured. Even before his execution Rickard tells Rob to kill him and he will be cursed, Rob not listening to him simply executes him personally and Karstark's men are also executed for his betrayal.

But later Karstark's son and Harald Karstark became an ally of the Boltons and the enemy of the Starks after Rickard's death.