|Died||In 10 AC, Oldtown|
|Father||Lord Manfred Hightower|
|Book(s)||Fire & Blood (mentioned)|
In 10 AC during the First Dornish War, Lord Manfred Hightower dispatched his eldest son, Ser Addam, to lead a host against Lord Fowler at Nightsong. With most of the Hightower strength away, Ser Joffrey Dayne led a second army against Oldtown. The young Garmon led a sortie against the Dornishmen, but he was slain in battle by Ser Joffrey.
- Fire & Blood, Reign of the Dragon - The Wars of King Aegon I.