In Belluno, Gaspare Diziani was a pupil of Antonio Lazzarini, the last provincial, but by no means not ignoble, interpreter of Baroque tenebrism. His real artistic training, however, took place in Venice (c. 1709-11), first at the school of Gregorio Lazzarini and later, and with greater success, at that of his fellow countryman Sebastiano Ricci.
Legend has it that in 508, during the siege of Rome by the Etruscans led by Porsenna, a young Roman aristocrat proposed to the Senate to kill the Etruscan commander. Once inside the camp, he went to stab the commander but got the wrong person. Once captured and brought before Porsenna the young Roman did not hesitate to confirm his intention to kill the king and placed his right hand on the fire to punish his hand for the mistake. The painting depicts this scene.