 Biographer Michael Scott writes that by the end of the war in 1918, Caruso's annual income tax bill amounted to $154,000.Prior to World War I, Caruso had been romantically linked to an Italian soprano, Ada Giachetti, who was a few years older than he was.Though already married, Giachetti bore Caruso four sons during their liaison, which lasted from 1897 to 1908.