Romanus IV (Romanus Diogenes) dīŏj´ənēz [key], d. 1072, Byzantine emperor (1068–71). A Cappadocian general, he succeeded Constantine X by marrying his widow, Eudocia Macrembolitissa. After some early successes against the Seljuk Turks he was crushingly defeated and captured (1071) by Alp Arslan at Manzikert . He was ransomed and promised to pay tribute, but he was deposed and blinded by his stepson, Michael VII, and soon died.
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