When, in the 5th century A.D., owing to theological differences the Syriac-using Christians became divided into Nestorians or East Syrians and Jacobites (Monophysites) or West Syrians, certain differences of pronunciation, chiefly in the vowels, began to develop themselves.
The biruna of the Chaldaean Nestorians, on the other hand, worn by all bishops, is a sort of hood ornamented with a cross.
Modern missions have made no great conquests there, and in earlier times the Nestorians and Jacobites who penetrated to central Asia, China and India, received respectful hearing, but never had anything like the success which attended Buddhism and Islam.
The proportion borne to one another by the different religions, as estimated in 1910, is: 50% Mussulman, 41% Orthodox, 6% Catholic, 3% all others (Jews, Druses, Nestorians, &c.).
In Asia Minor the Kurdish troops under Ibrahim Pasha revolted, and, although they were defeated with the loss of their commander, the Kurds continued to attack indiscriminately the Turks, Nestorians and Armenians; disturbances also broke out among the other reactionary Moslems of this region, culminating in a massacre of the Armenians at Adana.