Ceiling with Allegorical Figures and the Arms of Pope Sixtus V (Guerra's outer drawing); Saint Joseph and the Christ Child (Viani's central drawing)
Giovanni Guerra · outer drawing c. 1587; central drawing after 1690; attachments c. 1700-1725
pen and brown ink with brown wash over black chalk on heavy laid paper (outer drawing); graphite on heavy laid paper (central drawing); gold leaf borders and paper cut-outs adhered to oculi (Talman additions)