What can you tell me about these chaps?
Only one is a 'chap' and the other is a true lady. The two are William and Mary, the king and queen of England in the late 17th century. Have you heard of William and Mary style furniture? It's named after them
Why is this called a charger?
In a Western context, a charger is a decorative plate used in formal dinner services. It is placed underneath the plate that's being eaten from to add a splash of color, though no food actually touches it. Although these dishes could have been placed on a table, often they were hung on the wall as decoration (they don't fade like a print might) or on a wooden sideboard to provide color. This charger is decorated with images of King William and Queen Mary who reigned in England 1689 to 1702. The design on this charger would have been copied from a print celebrating the reign of the monarchs.
The word comes from the Middle english "chargeour".