This passage, excerpted from a sermon delivered by Giordano da Pisa, speaks to the authority perceived in Byzantine icons by viewers in late medieval Italy. The author, a Dominican friar, praises “ancient images that come from Greece” as a reliable font of historical information about the saints and self-evident proof of their lives and works. In privileging visual evidence linked to an allegedly traceable source, he validates the role of the artist as a primary witness, which, in the early fourteenth century, was still a novel idea. Embedded in Giordano’s argument are comments about origins and geography that imply that there is a positive correlation linking the foreignness of an object with its antiquity—and, thereby, its authenticity. This passage exhibits the role of art and myth in reinforcing that assumption.