Maruyama Chihiro was a citizen of the Terran Federation and a member of Eric Langhorne's staff in Operation Ark.

Maruyama wrote at least one book, named for him, in the Holy Writ, the sacred text of the Church of God Awaiting. He was the model for the Archangel Chihiro, patron of personal protection and recorder of Safehold's origin. The Book of Chihiro also described the events of Langhorne's death and Shan-wei's fall. (OAR)