Sylvester was known as Constantine's Pope. Yes, that Constantine, who converted on a battlefield and effectively legalized Christianity.

This blind contour was worth a 2-page spread in the sketchbook. That's Sylvester on the left, blessing the battle-hardened Constantine on the right. Followers of both men look on from behind, with dubious looks on ther faces, as if they're not sure how this whole church-state thing is going to work out.