Focus on The Bravo (Titian) and discuss the History and attribution.
The painting was probably in the Venetian collection of Zuanantonio Venier in 1526, who had one then described as "two half-figures attacking each other by Titian".  In 1636 it was sold to the Duke of Hamilton, who brought it to London.  Most of his purchases were from the collection of Bartolomeo della Nave, who perhaps had it by then. After Hamilton's execution, it was acquired by Archduke Leopold Wilhelm of Austria, whose collection later became part of the Habsburg imperial collection in Vienna, then passed to the Kunsthistorisches Museum. 
An etching after a reduced copy by David Teniers the Younger shows the painting attributed to Giorgione. The painting must have been a popular painting when it was in the Archduke's cabinet, as it was portrayed in some of his gallery paintings by Teniers.
The work was attributed to Titian by the Italian art historian Roberto Longhi, which remains usual. But for  John Steer the painting was "surely by" Palma Vecchio.
Palma Vecchio Bartolomeo della Nave David Teniers the Younger John Steer Kunsthistorisches Museum Duke of Hamilton Roberto Longhi Titian Vienna Giorgione Archduke Leopold Wilhelm of Austria