Alanus Perryn (formerly Rivers) is the legitimised bastard son of Lord Ganthen Perryn.
Alanus was born the son of Gathen Perryn, a lord in the Stormlands and a common woman named Mellyna. When he was born her mother seeked out Lord Perryn, and seeing the babies grey eyes, the same as his, he claimed the child, giving him the last name Rivers. When his half-brother was killed during the siege of King's Landing led by Stannis Baratheon, he was taken to live with his father and true-born brother Denlen. his father legitimised him when he arrived, giving him the last name Perryn.
Alanus is tall, with a slight build and with grey eyes and dark hair.