While in Malta in 1608, Caravaggio painted one of his most sensational paintings – “The Beheading of St. John the Baptist.” Measuring 12ft. (3.7n) x 17ft. (5.2m), the massive oil on canvas work depicts the moment after the executioner had used his sword to decapitate the Baptist. We now see him reaching for his knife to complete the gruesome act, and perhaps even more gruesomely, Caravaggio has used the blood of the Baptist to add his own signature to the painting.