The actor is perhaps best known by American TV audiences for his role as Jon Snow's mentor, Maester Aemon Targaryen, on the HBO series, Game of Thrones. Vaughan started portraying the character at age 86 and remained on the show for five years until his character died of old age in season five.
Following news of Vaughan's death, GoT writer Bryan Cogman took to Twitter to pay tribute to the actor. "Rest in Peace to our own Maester Aemon, Peter Vaughan, who passed away this morning at age 93," Cogman wrote. "Truly an honor to have known him."