Symmachus, Senator, father-in-law of Boethius, executed, 32 _Syntagma_, a collection of canons, compiled, 85, 178 Syria, 100-1, 156; Syrian Church, Monophysite and Nestorian, 9; National Church, 13; monks disregard the Fifth General Council, 20; Jacobites in, 23, 84; Adoptianism in, 79; Monophysitism, 110; Monothelitism, 89; Muhammadan invasion, 108 Tarasius, patriarch of Constantinople, 164 Tartars, 96-7 Tauresium, 91. _See_ Justiniana Prima Tebessa (in modern Algeria), monastery, 106 Thaddeus, Studite monk, 162 Theandric energy, 87, 89 Theodebert I., Frankish king, 47 Theodelind, Lombard queen, 56, 69, 134-5 Theoderic III., king of Neustria, 146 Theodora, empress (842), wife of Theophilus, 165 Theodora, paramour of Pope John X., mother of Marozia, 196 Theodore of Mopsuestia, 16-18 Theodore of the Studium (or the Studite), S., 124, 156, 160-4 Theodore of Tarsus, 115, 117, 169 Theodoret of Cyrrhus, 16-18 Theodoric the Ostrogoth, king of Italy, 29; his tolerant ecclesiastical policy, 30; executes Symmachus and Boethius, 32; aims at a united Italy, 60 Theodoric II., Frankish king of Burgundy, son of Childebert II., 56 Theodosia, S., 158 Theodosius II., emperor, 67 Theology, important in this period, 1; the predominant interest in the literature, 5; the theology of statesmen and military men, 9, 87; theology at Constantinople, 8, 156; iconoclastic, 158-9; theology of S. John Damascene, 159-60 Theophanes, Greek chronicler (758-817), 111 Theophilus, emperor, 165 Thessalonica, 67-8, 123 Theudberga, wife of Chlothochar, king of Lotharingia, 191 Theudis, Wisigothic king in Spain, 74 Thomas of Edessa, 99 Thormod, missionary priest in Iceland, 132 Thorwald Kothransson, Icelander, 132 Thrace, Paulicianism in, 80 "Three Chapters," controversy of the, 16-20, 22, 62-3, 72, 99, 106-7 Thuringia(ns), 135-8 Tiberius II., emperor, 22 Tithes, 140 Toledo, cathedral of, 76; councils, 72; Third Synod (of 589), 76, 80; Fourth (of 633), 81; Sixteenth (of 695), 77 _Tome_ of S. Leo, 63 Tomi, monks of, 14 Tonnenna, Victor of, 106-7 Totila, Gothic king, 37 Tours, 168; battle of, _see_ Poictiers. _See also_ Gregory of Tours Transubstantiation, 171 Trier (Treves), archbishop of, 192 Trullian Council (691) at Constantinople, 85, 89-92 Tunis, survival of the Church of, 110 _Type_, issued by Constans II., 88 Tzani, Asiatic people, converted, 94 Unity, the central idea of the period, 2, 154, 203; need of unity in the Church, 70 "Universal bishop," title declined by Gregory the Great, 66; Cluniac ideal, 175 Urban II., pope (1088-99), 174