|Died||In 42 AC, at Dragonstone|
|Book(s)||The World of Ice & Fire (mentioned)|
Gawen served as Grand Maester for King Aegon I Targaryen. Between 20 AC and 26 AC, he and Ser Osmund Strong, Aegon's Hand of the King, were charged with raising walls around King's Landing. Gawen continued to hold the office of Grand Maester during the reign of Aegon I's heir, King Aenys I Targaryen. When King Aenys fell ill on Dragonstone in late 41 AC, Gawen despaired of improving the king's condition.
Following the death of King Aenys I and the coronation of Aenys's half-brother Maegor I Targaryen by his mother Visenya Targaryen, Gawen protested. He stated that following the laws of inheritance the crown should pass to Aenys' oldest son, Prince Aegon. Maegor personally beheaded Gawen for his protests with Blackfyre. After Gawen's death, there were no further protests on Dragonstone. Gawen was the first of three Grand Maesters who were executed during Maegor's reign.