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A knight of Aerys II's Kingsguard and a member of House Whent.
He is tall and gangling with long white hair and a great hooked nose.
Ser Oswell, Ser Arthur Dayne, and Ser Gerold Hightower are ordered by Rhaegar Targaryen to guard Lyanna Stark at the Tower of Joy when Robert's Rebellion breaks out.
They are still there after Aerys II is killed and Eddard Stark comes to take her back. They refuse to yield, and Eddard and his companions are forced to kill all three.