From A Wiki of Ice and Fire
|Title||Lord of Highgarden Warden of the South|
|Book(s)||A Storm of Swords (Mentioned)|
Lord Luthor Tyrell, Lord of Highgarden, Warden of the South, was the former head of House Tyrell. He is the father of the current lord, Mace Tyrell. He rode off a cliff to his death while hawking. He had been looking up and not paying attention to where his horse was going.