From A Wiki of Ice and Fire
|Book(s)||The World of Ice & Fire (mentioned)|
Gareth was a maester who wrote the book Red Sands. In it, he chronicles several Dornish letters, which suggest that it was Lord Qorgyle of Sandstone who had arranged the murder of Lord Lyonel Tyrell during the conquest of Dorne.
- The World of Ice & Fire, The Targaryen Kings: Daeron I.