From A Wiki of Ice and Fire
|Book(s)||The World of Ice & Fire (mentioned)|
Willam Stackspear was a member of House Stackspear. In 136 AC he was chosen by lot in a Great Council to become one of the seven regents for King Aegon III Targaryen. He held office until the council was dissolved that same year.
- The World of Ice & Fire, The Targaryen Kings: Aegon III.