to Jerusalem. It bore at that period the name of St. Stephen; St. Gabriel was bishop of the monastery during the reign of Heraclius. When the Arab invaders drove out the forces of the Byzantine empire, he obtained from the Khalif ’Umar ibn u’l Khaṭṭâb rights of jurisdiction over all Christians in the Ṭûr ’Abdîn, for which reason the monastery is sometimes called after him, Deir Mâr Gabriel, and sometimes after the khalif, Deir ’Umar. It was despoiled by Tîmûr towards the close of the fourteenth century, and many a harrying it must have endured from the Kurds before it sank into its present state of poverty and decay. One monk and a single nun, well stricken in years, were its sole occupants at the time of my visit. The church of Mâr Gabriel is built upon a plan which I conjecture to be monastic as distinguished from parochial. The two types, which are quite unlike each other, are also unlike all churches known to me outside the Ṭûr ’Abdîn. The parish church (Fig. 198), which has no domestic buildings attached to it, or nothing but a few chambers for the lodging of clerks, follows invariably the plan that I have described at Bâ Sebrîna; at Mâr Gabriel, and in the other monastic churches (Fig. 199), the atrium and narthex lie to the west, the vaulted nave is placed with its greater length running from north to south, and three doors in the east wall communicate with a triple sanctuary. From what prototypes did the Christian architects of the Ṭûr ’Abdîn derive the singular feature of the nave lying with its greater length at right angles to the main axis of the building? I can only suggest that they may have preserved the ancient scheme of the Babylonian temple and palace hall, which was retained by the Assyrians in their palaces, but not in their temples; and if this be so, the monastic churches of the Ṭûr ’Abdîn are the last representatives of the oldest Oriental architecture. The walls and vault of the nave of Mâr Gabriel are devoid of ornament, but the vault of the central sanctuary is adorned with mosaics. The accumulated soot of centuries of candle-smoke has not entirely obscured the glory of its golden ground, of the great jewelled cross laid over the centre of the vault, and the twisted vine scrolls with which it is encircled. It is said that similar mosaics once covered the whole church and were destroyed by the soldiers of Tîmûr. [Illustration: FIG. 199.--ṢALÂḤ, MÂR YA’ḲÛB; MONASTIC TYPE.]