From A Wiki of Ice and Fire
|Book||Fire & Blood (mentioned)|
Umbert was an archmaester at the Citadel of Oldtown. He was known for his writings on the reign of King Jaehaerys I Targaryen, which he wrote a century after the Old King's reign.
- ↑ Fire & Blood, Prince into King - The Ascension of Jaehaerys I.