 The Inner Courtyard, decorated between 1564 and 1567 with grisaille painting "al fresco" (grey painting on still-wet plaster), is among the best-preserved examples of fresco from the sixteenth century.The representations of princely virtues and muses, female and male heroes, and diverse heroic acts sought to display the royalty as exemplary.They relate to their commissioner Archduke Ferdinand II, patron of the arts and host of lavish festivities.