Saint Seiya: Legend of Sanctuary.

Mitsumasa Kido discovers a misterious baby in the himalayas whom he adopts as his grandaughter. 16 years later, Saori Kido is a young girl troubled by her mysterious powers. She is saved by Seiya from an assassin sent to kill her. Saori then learns she is the reincarnation of the Goddess Athena with Seiya being one of her Saints sworn to protect her. Upon learning of her destiny, she heads to the Sanctuary to rebel against the Pope's murderous plot.