|Died||In 12 AC, at King's Landing|
|Book(s)||Fire & Blood (mentioned)|
Grand Maester Lyonce was a maester of the Citadel. He became Archmaester whose Ring, Rod and Mask were gold.
Lyonce was appointed Grand Maester during the reign of King Aegon I. Lyonce become the second man in history to hold the title of Grand Maester after the death of Grandmaester Ollider who passed away after less than a year of being in office in 5 AC. Lyonce proved more robust than his predecessor, serving the realm ably for seven years until he slipped, breaking his hip and passed away soon after. 
- Fire & Blood, Three Heads had the Dragon - Governance under Aegon I.