Ultimately, Byzantine architecture in the West gave way to Romanesque and Gothic architecture. In the East it exerted a profound influence on early Islamic architecture, During the Umayyad Caliphate era (661-750), as far as the byzantine impact on early Islamic architecture is concerned, the byzantine artistic heritage formed a fundamental source to the new Islamic art, especially in Syria and Palestine. There are considerable byzantine influences which can be detected in the distinctive early Islamic monuments in Syria and Palestine, as on the Dome of the Rock (691) at Jerusalem, the Umayyad Mosque (709-15) at Damascus. While the Dome of the Rock gives clear reference in plan - and partially in decoration - to byzantine art, the plan of the Umayyad Mosque has also a remarkable similarity with the 6th -7th c. normal Christian basilicas, but it has been modified and expanded on the transversal axis and not on the normal longitudinal axis as in the Christian basilicas. This modification serves better the liturgy for the Islamic prayer. The original mihrab of the mosque is located almost in the middle of the eastern part of the qibla wall and not in its middle, a feature which can be explained by the fact that the architect might have tried to avoid the impression of a Christian apse which would result from the placement of the mihrab in the middle of the transept. The tile work, geometric patterns, multiple arches, domes, and polychrome brick and stone work that characterize Islamic and Moorish architecture were influenced to some extent by Byzantine architecture. In Bulgaria, Russia, Romania, Serbia, Georgia, Ukraine, and other Orthodox countries the Byzantine architecture persisted even longer, finally giving birth to local schools of architecture.