Suddenly everything is clear.
«Constantine is the emperor we are looking for,» she said.
«The emperor his holiness had told me about?» she asks.
«I think so: it is he, after all, who changed the history of Christianity.»
Chiara continues to look at the photo with the epigraph.
«And what does this dish of San Giovanni have to do with it?»
«It just made me think of him. Do you see these letters: I, H, S, V? This is the famous motto in hoc signo vinces.»
«Famous?»
«Have you ever been to Arezzo?»
«During the time I lived in Rome, I went to see the antiques market one Sunday," recalls Chiara.
«And haven't you visited the church of San Francesco?» She denies with her head.
«What's in that church?»
«Behind the altar there is a wonderful pictorial cycle by Piero della Francesca.»
«Now
