|In 300 AC, the coast of the Disputed Lands
|A Dance with Dragons (mentioned)
Willam has freckles and crooked teeth.
A Dance with Dragons
Ser Willam is one of Prince Quentyn Martell's travelling companions on his way to find Daenerys Targaryen in the Free Cities. While traveling to Volantis disguised as merchants, their ship, the Meadowlark, is attacked by corsairs off the coast of the Disputed Lands and Willam is among those killed.