Just to be clear, "Syriac" does not refer to an ethnic group or to a particular Christian denomination, but rather to the important dialect of Aramaic which became a principal language of Semitic Christians in Late Antiquity. In fact it is shared by Christians belonging to churches from a wide array of confessions, from Monophysites (who historically did not accept the Council of Chalcedon) to Nestorians (who especially objected to the Council of Ephesus). A few groups in communion with Rome use it as a liturgical language, e.g. the Maronites. Originally the dialect of northern Mesopotamia and eastern Anatolia, it is fairly similar to the Jewish Talmudic Aramaic of Babylon, but not so similar to the Palestinian Aramaic of Jesus.