Madonna and Child with Saints Catherine and John the Baptist

Marble relief sculpture, rectangular with a frame; central figure of a woman sitting on a throne-like chair with a child on her lap; woman wears a long dress; child wears a cloth; woman has a veil covering her hair; on her right side a man with a long beard stands; on her left side a woman stands; both individuals wear long robes; above them, a decorative arch; the frame has a gothic-style design.