Origin
Trevor Slattery is a British actor, he was hired by Aldrich Killian to play Mandarin, leader of the organization Ten Rings.
Creation
Trevor Slattery was created specifically for the 2013 live action motion picture, Iron Man 3, and continued to appear in later Marvel Cinematic Universe films. He made his first literal comic book appearance in the Captain America: Civil War tie-in comic “Marvel’s Captain America: Civil War Prelude #2 – Part Two”.
Movies
Actor Ben Kingsley played Trevor Slattery in 3 Marvel Cinematic Universe films.
Iron Man 3
Trevor appears on television as the terrorist Mandarin, leader of Ten Rings, but it was all a plan by Aldrich Killian of Advanced Idea Mechanics (AIM), the plan is discovered by Tony Stark and he is arrested.
Marvel One-Shot: All Hail the King
Jackson Norriss, member of the Ten Rings pretends to be a documentary filmmaker and kidnaps Trevor Slattery from prison.
Shang-Chi and the Legend of the Ten Rings
Trevor is shown living as a jester at the headquarters of Wenwu, the true leader of the Ten Rings.