On hearing that the Doge of the Republic, Giovanni Battista Lomellini, had been advised to turn down a painting commissioned from him, Castiglione drew his sword and slashed the work to shreds in front of the Doge's court, swearing that the Lomellini would never again have a work from his hand. Having insulted Genoa's most powerful family he then had to flee the city in disguise.(The Adoration of the Shepherds)
Rembrandt's etchings, and you can perhaps see some northern influence in this possible (but much disputed) self-portrait of about 1645.
has been called "one of the most exciting drawings of the Baroque period," which seems a bit excessive to me, but it is quite nice.