From A Wiki of Ice and Fire
|Died||In 12 AC or 13 AC, King's Landing|
|Book||Fire & Blood (mentioned)|
Lyonce was appointed Grand Maester during the reign of King Aegon I following the death of Grand Maester Ollidar, the first Grand Maester of the Seven Kingdoms. Lyonce held the office for seven years, until he slipped, broke his hip, and died.
- Fire & Blood, Three Heads had the Dragon - Governance under Aegon I.