The PS in Art

"San Miguel de Zafra" by Anonimo, the Prado in Madrid. Is that a P and an S in the banner? - also below - a P S in the banner of the angel?


"Annunciation" the Prado, Madrid.

PS?

The design on the Giorgione staff reminds me of the Centurion stone that Ben found. The Giorgione drawing looks like a Native American to me.


"Affresco del Giorgione ... velata allusione al Priorato di Sion - P S?"