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An architectural frontispiece features an octagonal portrait of a man with a beard, identified as the architect Domenico Fontana, holding a measuring rule. Above the portrait is the coat of arms of Pope Sixtus V (featuring a lion, stars, and mountains). The entire composition is framed by classical columns and decorative scrollwork.
DOMENICO FONTANA, ROMAN PATRICIAN FROM MELIDE, DIOCESE OF COMO, KNIGHT.