Peter Paul Rubens, Melchior,the Assyrian King
On the lower level of the National Gallery of Art. In a little, out-of-the-way room (rm. G13A). Practically need a star to lead you to it.
Pretty soon: 20 C + M + B 13! The Mayans equivocaron, and time marches on.
All glory to the Babe of Bethlehem.