By the time Islam appeared in the Arabian peninsula, the two other civilizations in the region, the Byzantines in the north and the Sassanids in the east, had come to adopt variations of two monotheistic religions, Christianity and Zoroastrianism, respectively. Several forms of Christianity prevailed elsewhere in the Middle East: the Coptic Church in Egypt, the Jacobite Church in Syria, and the Nestorian Church in Iraq. Parts of eastern Iraq were also Zoroastrian, as was almost all of Iran, where the tradition of divine kingship did not die out until after the Arab conquest, and even then not very thoroughly. Jewish and pagan communities were also scattered throughout the area, including in the Arabian peninsula, where a majority worshipped local deities. The religious makeup of the Middle East at the time of Islam’s appearance tells us much about other aspects of life in the region. With religion came the increasing differentiation of authority and the development of religious and administrative hierarchies. Depending on local circumstances and conditions, local priests (mobads for Zoroastrians), bishops, and popes could become tremendously influential in the day-to-day lives of ordinary people, some even influencing the fates of entire dynasties. Places of worship and congregation also assumed importance not only for articulating and perpetuating religious values but as sources of local organization and mobilization. Equally important was the use and manipulation of religion by existing or aspiring political leaders, whether at the level of the local community or the empire, the most brilliant manifestation of which could be found in Constantinople. Life was organized, and still is today, into three distinct but at times interrelated communities. First were urban communities, cities where markets and money economies had been firmly established, elaborate political and administrative apparatuses had been set up, and religious power and authority, as well as liturgy and customs, had evolved (Source: Political History of Middle East).