Spanish School, portrait of Balthasar Charles (1629-1646), Prince of Asturias, 105 x 198 cm No visible signature (Spanish School), portrait of Balthasar Charles (1629-1646), Prince of Asturias, with the inscription 'El P. Do. Baltazar Carlos' (El Principe Domine Baltazar Carlos), 17thC, oil on canvas on multiplex, 105 x 198 cm Balthasar Charles was the son of Philip IV of Spain and for a short while the crown prince, he was engaged with Archduchess Mariana of Austria. Unfortunately, his short career was ended when he was murdered in 1646 by a conspiracy within the Spanish court's entourage.