From A Wiki of Ice and Fire
|Title||Lord of the Hellholt|
|Book||Fire & Blood (mentioned)|
Uthor Uller was the Lord of Hellholt and the head of House Uller during the First Dornish War.
During the First Dornish War, King Aegon I Targaryen sent Lord Harlen Tyrell against Lord Uller, though found Hellholt abandoned when he reached the castle.
After the death of Queen Rhaenys Targaryen, four successive Lords of the Hellholt were murdered, for the Iron Throne's ransom on the head of any Dornish lords. It is likely that Lord Uthor was the first of these lords.
- ↑ 1.0 1.1 1.2 1.3 Fire & Blood, Reign of the Dragon - The Wars of King Aegon I.