Shion is the original Grand Pope of Sanctuary, as well as one of the remaining survivors of the Holy War from the 1800s. He also served as the master of Aries Mu, who would eventually inherit the Gold Cloth of Aries from him.

Shion is one of last survivors of the race that inhabited the lost continent Lemuria (also called Mu). Due to this, he has a life span much larger than that of a normal human, what allowed him to live more than two hundred years.

He is a close friend of Libra Dohko, the only survivor of the last generation of saints together with Shion, and the master of Aries Mu.

(Source: Wikipedia)