Page "Saint Vincent Panels" Paragraph 18

This alternative hypothesis can be used to help clarify the Panel of the Prince in the St. Vicent polyptych, as being composed of royals only-that is, kings and queens in pairs.

Thus, the standing pair would be King Edward ( in black chaperon, standing on right ) mirroring his wife, Queen Eleanor of Aragon ( standing on left ).

Whereas below them, is their son, King Afonso V of Portugal ( kneeling on right ) facing his consort, Queen Isabella of Coimbra ( kneeling on left ).

Finally, the boy in the picture is the royal heir, future King John II of Portugal.