Dara taken in the Persian wars, 136 Dastagerd taken by Heraclius, 138 David Comnenus defeated by Theodore I., 299 Delphic tripod, the, 24; mutilated by Mahomet II., 349 Delphic oracle, the, orders foundation of Byzantium, 3 Digenes Akritas, epic of, 222 Diocletian makes Nicomedia his capital, 15 Diogenes, Romanus, reign of, 251; defeated at Manzikert, 254; slain, 256 Ducas, _see under_ Constantine X., Michael VII., John III., Theodore II. Durazzo, battle of, 260 Dushan, Stephen, king of Servia, conquests of, 327 Ecloga, the, Leo III.’s code of laws, 194 Eesa, Sultan, 334-5 Egypt, conquered by the Persians, 134; conquered by the Saracens, 164; separated from the Caliphate, 227 Eikasia, story of, 211 Emesa, taken by the Saracens, 163; taken by Nicephorus Phocas, 231 Epirus, the despotate of, 298, 301, 304, 327 Ertogrul, the Turk, 322 Eudocia (Athenaïs), wife of Theodosius II., her disgrace, 56 Eudocia, wife of Romanus Diogenes, 251 Eudoxia, Ælia, wife of Arcadius, 52 Eugenius IV., pope, treaty of, with John VI., 341 Euphrosyne, wife of Michael the Amorian, 207 Eutropius, minister of Arcadius, 47; protected by Chrysostom, 50 Euphemius, rebel in Sicily, 208 Exarchate, of Ravenna, 119; conquered by the Lombards, 196 Fatimite dynasty in Egypt, 243 Ferrara, John VI. at Council of, 341 Flaccilla, benevolence of, 156 Florence. Council of, 341 Franks, threaten Italy, 89; summoned by Witiges, 91; protect the Papacy, 196 Fritigern, Gothic ruler, 35-7; victory of over Valens, 40 Fravitta defeats Gainas, 31 Gainas, minister of Arcadius, 47; rebellion of, 50; slain, 51 Gallienus, Byzantium destroyed by, 10 Gallipoli seized by the Turks, 329 Ganzaca burnt by Heraclius, 136 Gelimer, king of the Vandals, 81; defeated and captured, 85 Genoa, rise of, 263; trade of, with the East, 267; allied to Michael Paleologus, 314; sends aid to Constantine XI., 344 George the Alan, 318 George of Pisidia, poems of, 221 Giustiniani, John, defends Constantinople, 344-8 Godfrey of Bouillon, 264 Goths, early history of, 32; cross the Danube, 37; defeat Valens, 39; besiege Constantinople, 41; submit to Theodosius, 42; the Visigoths under Alaric, 48; quit the East, 49; the Ostrogoths under Theodoric at war with Zeno, 62; invade Italy, 64; kingdom of, attacked by Belisarius, 86; wars of, with Justinian, 88-94; defeated and destroyed, 95 “Grand Company,” the, hired by Andronicus II., 317; ravage Thrace, 318; conquer Athens, 319 Greece, invaded by the Goths, 48; overrun by the Slavs, 125; conquered by the Crusaders, 296, 297 Greek fire, invented, 170; used by the Byzantine fleet, 220 Gregory the Great, Pope, 120, 121 Guiscard, Robert, wars of, with Alexius I., 259-61 Haroun-al-Raschid, wars of, with Nicephorus I., 203 Helena, mother of Constantine I., 19 Hellas, theme of, 168; revolts against Leo III., 193 Henry of Flanders, Emperor, 295-6