Sabas, S., 15 Sabbas, archimandrite of the Studium, 162 Sabellians, followers of the heretic Sabellius (third century), 178 _Sacramentary_ of Pope Gelasius I. (492-6), 182-3; of Gregory the Great, 182 Sacraments, 176-181 Saints, Celtic "age of saints," 53; Merwing, 51; images of the, 156-7 Salzburg, archbishopric, 127, 135, 138 Samaritans, 100 Samarkand, Nestorian bishopric of, 98 Sancho the Great, king of Navarre (970-1035), 78 Sapor II., king of Persia, 93 Saracens, 77, 158, 172; in Africa, 109; in Spain and Gaul, 146. _See_ Muhammadans. Saxons, 135; forcible conversion by Charles the Great, 140-2, 197; the Saxons in Britain, 113, 117-18, 176; "Old" Saxons of the Continent, 180 Schism between East and West, formal beginning due to Monophysitism, 8; schism of 484-519, 68; schism of 649-81 caused by the _Ecthesis_ and _Type_, 88; steps towards, 149; the Photian, 192-4 Schleswig, converted, 130 Scholarship, 5, 38, 55. _See_ Learning Scholastica, S., sister of S. Benedict, 37 Scilly Isles, 132 Scotland, Church in, 114, 116-17, 119 Scotus, Johannes. _See_ John the Scot Sebert, king of the East Saxons, 176 Seleucia, see of, 93 Semi-Pelagianism, 72, 81 Septimania, 77, 146 Serbia, Church of, 124 Serbian Church, 23, 84 Sergius I., pope, 91 Sergius I., patriarch of Constantinople, 83, 87 Sermons, 64-5, 120, 163, 185, 188 Severus, Monophysite patriarch of Antioch, 10, 15, 86 Severus, patriarch of Aquileia, 62 Sigambrians, a Teutonic tribe, allied to the Franks, 43 Sigebert (Sigibert), Frankish king of Austrasia, 43, 54, 75 Silvester II., pope, 7, 125, 200-2 Simplicius, pope, 8 Siricius, pope, 195 Slaves, slavery, 130; freed by Gregory the Great, 65; Jews enslaved in Spain, 77 Slavs, 44, 84; Charles the Great allied with heathen, 141; conversion of, 123-9; attacked by Otto I., 197 Smbat, supposed author of the Paulician _Key of Truth_, 80 Soissons, 139, 195 Sophia, S., the Church of the Divine Wisdom, at Constantinople, 25-7; Church of, at Kiev, 127 Sophronius, patriarch of Jerusalem, 87 Soracte, monastery, 145 Spain, 172, 196; Gregory the Great active in, 65; invaded by the Franks, 74; Dagobert I. influential in, 44; Charles the Great in, 140; conflict of Arianism and Catholicism in, 48; Catholicism wins, 62-3, 73, 75; conquered by the Muhammadans, 77-8; Church has to contend with Islam, 72; Catholicism survives in the North, 78; Eucharist, 179; Spanish rite, 183; literature, 73 Squillace, monastery, 38-9 Stephen II. (or III.), pope, 148-9 Stephen III. (or IV.), pope, 151 Stephen, king of Hungary, 201 Strathclyde, early British Church of, 113 Studium, the, monastery at Constantinople, 161-3 _Stylites_, 25 Subiaco, S. Benedict at, 35 Suevi (a Teutonic confederate people) in Gaul, 41. _See_ Mir, Remismond Sweden, missions to, 129-30 Syagrius, bishop of Autun, 49, 67 n.