ENZIO (c. 1225-1272), king of Sardinia, was a natural son of the emperor Frederick II., and married, in 1238, Adelasia, widow of Ubaldo Visconti and heiress of Torres and Gallura in Sardinia. Enzio took at once the title of king of Torres and Gallura, and in 1243 that of king of Sardinia, but his sovereignty existed in name alone. In July 1239 he was appointed imperial vicegerent in Italy, and sharing in his father's excommunication in the same year, took a prominent part in the war which broke out between the emperor and the pope. He commenced his cam paign by subduing the march of Ancona, and in May 1241 com manded the forces which defeated the Genoese fleet at Meloria. Later he fought in Lombardy. He was wounded and taken prisoner by the Bolognese at Fossalta on May 26, 1249, and re mained a captive until his death on March 14, 1272. His mar riage with Adelasia had been declared void by the pope in he left one legitimate, and probably two illegitimate daughters. See F. W. Grossman, Konig Enzio (Gottingen, 1883) ; and H. Blasius, Konig Enzio (Breslau, 1884) •