
In the early part of this period, Sasanians control most of Mesopotamia, which sharesto the westan unstable border with Byzantium. In the seventh century, this area is conquered by Arab armies and transformed into the center of Islamic civilization. Under the cAbbasid caliphate, the newly founded capital, Baghdad, becomes the cultural and commercial capital of the Islamic world. The distinctive artistic language that develops in Baghdad and Samarra is emulated throughout the realm and greatly influences Islamic art.
500s
Nestorian Christians, a sect of Christianity that diverged from the Byzantine church at the Council of Ephesus in 431, settle in large numbers throughout Sasanian-controlled land in eastern Mesopotamia. Attempts by the Byzantine state to gather support among these Christian communities meet with little success. 634644
During the reign of Rightly Guided Caliph cUmar ibn al-Khattab, Arab armies under the banner of Islam conquer Mesopotamia, penetrating into Iran. 661
cAli ibn Abi Talib (r. 65661), Muhammad's cousin, son-in-law, and last of the Rightly Guided Caliphs, is assassinated. His death triggers political and religious factionalism, especially in Iraq. Questions regarding succession lead to the development of Shiism, a sect of Islam that recognizes Muhammad's descendants through cAli and Fatima as the only legitimate heads of the community. 680
Husayn, the second son of cAli ibn Abi Talib, as well as his family and followers are killed in a battle against Umayyad forces at Karbala; the remembrance of this event and Husayn's martyrdom strengthen the Shici cause. 7501258
Under the cAbbasid caliphate, the focal point of Islamic political and cultural life shifts eastward from Syria to Iraq, where, in 762, Baghdad, the circular "City of Peace" (madinat al-salam), is founded as the new capital. During this period, a distinctive style emerges and a new artistic language is developed, which spread throughout the Muslim realm and greatly influence Islamic art. The first three centuries of cAbbasid rule are a golden age, with Baghdad as the cultural and commercial capital of the Islamic world. 786809
The reign of Caliph Harun al-Rashid, often regarded as the apogee of cAbbasid power, witnesses unprecedented prosperity, with resources flowing into Baghdad from all over the Islamic world. 813833
Under Caliph al-Mamun, literature, theology, philosophy, mathematics, and the natural sciences flourish. The remarkable cultural activity of the period is further enriched by the encounter with Greco-Roman, Persian, and Indian traditions and the translation of important texts into Arabic. 836883
The cAbbasid caliph al-Muctasim (r. 83642) founds a city north of Baghdad called Samarra, which replaces the capital for a brief period. New styles and techniques developed in Samarra are emulated throughout the cAbbasid realm. ca. 850
Due to internal conflicts, cAbbasid political unity begins to disintegrate and independent or semi-autonomous local dynasties (such as the Tulunids in Egypt) are established. 9001000
As the cAbbasid caliphate centered in Baghdad weakens further, several Iranian dynasties gain control in the eastern Islamic provinces, limiting cAbbasid political power to Iraq. 945
The forces of the Buyid dynasty (9321062) enter Baghdad; from this point onward, until the formal end of the dynasty in 1258, the influence of the cAbbasid caliphs is limited to the moral and spiritual spheres, as the heads of Orthodox Sunni Islam.|
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