Page 357 "the fish and the symbol of Saint Peter blending together around his face."

From page 357 of the book: I felt in my blood the lance of betrayal that he imagined had piked him.  I saw the streamers flowing from the lance, characters of the fish and the symbol of Saint Peter blending together around his face.

Painting of St. Peter's crucifixion

A composite I made of a lance piercing the symbol of St. Peter, the Vatican

[In ecclesiastical heraldry, the Papal coat of arms contain the keys of the office of St. Peter. The Keys of Heaven were, according to Christian tradition, received by Saint Peter from Jesus, marking Peter's ability to take binding actions.[1] Thus, the Keys are seen as a symbol of Papal authority still to this day. "Behold he [Peter] received the keys of the kingdom of heaven, the power of binding and loosing is committed to him, the care of the whole Church and its government is given to him [cura ei totius Ecclesiae et principatus committitur]