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Islam is a monotheistic religion. A believer is a Muslim, literally, "one who submits to God." Muslims believe that Allah (Arabic for God) gave revelations through the angel Gabriel to the Prophet Muhammad (A.D. 570-632 ), a native of the Arabian Peninsula city of Mecca. Muhammad's efforts to convert people to monotheism disturbed the merchant elite, who feared that his preaching would adversely affect the pilgrims who regularly visited Mecca, which in the early seventh century had shrines to several gods and goddesses. Mecca's principal destination for pilgrims was the Kaaba, a shrine housing a venerated black rock which over the years had been surrounded by various idols. The lack of acceptance by Meccans of Muhammad's preaching caused him and his followers in A.D. 622 to migrate to Medina in response to an invitation by that city's leaders. Muhammad's migration to Medina enabled him to organize the politico-religious community - the umma - that marked the beginning of Islam as a political movement as well as a religious faith. Thus, the date of the migration, or hicret (from the Arabic hijra), was adopted by the Muslim community as the beginning of the Islamic era. The Islamic calendar is based on a lunar year, which averages eleven days less than a solar year. The Islamic calendar is used in Turkey for religious purposes.

By the time of the Prophet's death ten years after his migration to Medina, most of the Arabian Peninsula, including the city of Mecca, had converted to Islam. During the last two years of his life, Muhammad led fellow Muslims on pilgrimages to Mecca, where the Kaaba was relieved of its idols and dedicated to the worship of Allah. Since then, praying at the Kaaba has been the ultimate goal of the pilgrimage, or hajj, which every able-bodied adult Muslim is expected to make at least once in his or her lifetime.

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