Gaius ir'Wynarn is a prince of Karrnath, and the brother of Kaius and Haydith ir'Wynarn. Gaius' father died when he was a baby, so he (alongside his siblings) was raised by his aunt, Moranna ir'Wynarn, who treated them like they were her own children.
As part of the hostage exchange organised by his brother to keep the peace, Gaius was relocated to Flamekeep, where the Silver Flame called to him. He is now a member of the Knights Templar, and a close friend and supporter of the Keeper Jaela Daran.
Gaius is unique in his outlook, having grown up amongst the Blood of Vol and now the Church of the Silver Flame. He has the perspective that no one else does, that the two faiths are actually incredibly compatible with each other, they only really disagree on the usage of undead.