- "Good fighter, Toyne, but he lacked stamina."
- ―Barristan Selmy
Simon Toyne was the leader of the Kingswood Brotherhood, a band of outlaws and bandits opposed to the rule of House Targaryen. They inhabited the Kingswood, a large area of woodland south-east of King's Landing. Roughly twenty years before the events of the series, King Aerys II Targaryen ordered the Brotherhood destroyed, a mission led by Ser Barristan Selmy of the Kingsguard. Selmy himself killed Toyne with a counter-riposte, a move witnessed by the then-squire Jaime Lannister.
Jaime recalls Selmy killing Toyne and cites Selmy's counter-riposte as the finest sword move he'd ever seen. Selmy says that Toyne was a good fighter, but lacked stamina.
In the books
House Toyne was formerly a house of honor, with one member - Ser Terrence Toyne - serving in the Kingsguard of King Aegon IV Targaryen. When Aegon IV found this knight abed with one of his mistresses, he had him executed in a horrible fashion. The knight's brothers declared war against House Targaryen, slaying the infamous Dragonknight, Ser Aemon Targaryen. Simon was their descendant and the last of his line.