Gideon Templeton († 1919 PD) was a Masadan native and a member of the Church of Humanity Unchained (Defiant). A son of Ephraim Templeton and his senior wife Dinah, he was the half-brother of Princess Ruth of Manticore. He fled Masada with his father and other men of their family when the Star Kingdom of Manticore conquered and occupied the planet. They later formed the Church of Humanity Unchained (Defiant), an even more radical sect of the Church of Humanity Unchained.