"the magnificent condescension of the monarch who had picked up Titian's brush for him"
Portrait of Charles V, Holy Roman Emperor
Public DomainPortrait of Charles V, Holy Roman Emperor - Credit: Titian, 1548

Tiziano Vecelli or Tiziano Vecellio (c. 1488 - 1576) is known in English as Titian.  He was an Italian painter, the most important member of the 16th century Venetian school. 

His contemporaries referred to him as "The Sun Amidst Small Stars". His painting methods, particularly his application and use of colour, exercised substantial influence on painters of the Italian Renaissance, as well as on future generations of Western artists. 

The Holy Roman Emperor, Charles V, is said to have picked up a brush Titian had dropped, at which the artist said, "Sire, I am not worthy of such a servant." The Emperor replied, "Titian is worthy to be served by Caesar."

Charles V was one of many regal subjects painted by Titian. Others included King Philip II of Spain, Queen Mary of Hungary, and Pope Paul III.