Lord of Castle Lychester|
Fire & Blood (mentioned)|
The Sons of the Dragon (mentioned)
During the Faith Militant uprising, Lord Jon took up arms on behalf of the High Septon and the Starry Sept against the Iron Throne. He fought in the battle at the Great Fork alongside Lord Rupert Falwell and other puissant knights from the westerlands and riverlands, as well as hundreds of Poor Fellows, against the royal army led by King Maegor I Targaryen himself. It is unknown if he survived.