Ser Jorah Mormont is an anointed knight of House Mormont and a former Lord of Bear Island. He was stripped of his title and sentenced to death, however he fled this judgement. He is the only son of Lord Commander Jeor Mormont.
He became Lord of Bear Island in his own right when his father joined the Night's Watch. He earned his knighthood during the Greyjoy Rebellion for being one of the first of the royalist forces through the walls of Pyke. Ser Jorah was attainted and exiled from the Seven Kingdoms for selling men caught poaching on his land to slavery in order to support his former wife's lavish lifestyle.
A Game of ThronesEdit
Jorah is invited to a celebration held by Khal Drogo within his manse. He is pointed out to Viserys and Daenerys Targaryen by Illyrio Mopatis. Daenerys expresses surprise at a Westerosi knight being so far from home. Viserys says that he will talk to Jorah before the evening is done. He comes into the service of Viserys during that evening.
Jorah becomes a constant companion of Viserys. He gifts Daenerys with books on the history of the Seven Kingdoms as a celebration of her marriage to Khal Drogo.