Changes

Tribal elders in a traditional council called the "Shura" elected [[Abu Bakr]] to be Muhammad's successor, or [[Caliph]] (Khalifa). Abu Bakr united the tribes of the Arabian peninsula during his two years as head of the new faith. Upon his death, the elders elected [[Umar ibn al-Khattab]] the next Caliph. During Umar's ten-year reign, Islam invaded and spread through conquest and negotiation into [[Egypt]], [[Syria]], [[Palestine]], [[Iraq]], and parts of [[Iran]]. Umar was assassinated by a Persian (modern day Iran) in 644, and was succeeded by [[Uthman ibn Affan]], who continued the invasions to spread Islam into [[North Africa]], [[Cyprus]], the rest of Iran, [[Afghanistan]], and parts of [[India]] and [[Pakistan]]. Over the next two centuries, Islamic armies continued to expanded Islam's empire into sub-Saharan Africa, [[Spain]], South-east and Central Asia, and [[Turkey]].

Tribal elders in a traditional council called the "Shura" elected [[Abu Bakr]] to be Muhammad's successor, or [[Caliph]] (Khalifa). Abu Bakr united the tribes of the Arabian peninsula during his two years as head of the new faith. Upon his death, the elders elected [[Umar ibn al-Khattab]] the next Caliph. During Umar's ten-year reign, Islam invaded and spread through conquest and negotiation into [[Egypt]], [[Syria]], [[Palestine]], [[Iraq]], and parts of [[Iran]]. Umar was assassinated by a Persian (modern day Iran) in 644, and was succeeded by [[Uthman ibn Affan]], who continued the invasions to spread Islam into [[North Africa]], [[Cyprus]], the rest of Iran, [[Afghanistan]], and parts of [[India]] and [[Pakistan]]. Over the next two centuries, Islamic armies continued to expanded Islam's empire into sub-Saharan Africa, [[Spain]], South-east and Central Asia, and [[Turkey]].

The Muslim armies conquered and superseded the ancient Sassanid and Byzantine empires which had ruled before. Within a generation of Muhammad's death Muslim armies occupied an empire stretching from the Nile river to the far off Iranian province of khorasan. Reasons for the rapid conquest are varied and obscure. The Arab armies were more akin to tribal war bands raiding and settling where and when they could. The Byzantine and Sassanid empires had been at war for centuries. The constant simmering conflict between Constantinople and Persia reached a climax in the early 7th century. The Sassanids conquered briefly Egypt and the Levant threatening the central Byzantine heartland of Anatolia. Under the military reforms of the emperor Heraclius, the Byzantine army consolidated and counterattacked, recapturing all that they had lost and capturing the Sassanian capital of Ctesiphon in 628.  

The Muslim armies conquered and superceded the ancient Sassanid and Byzantine empires which had ruled before. Within a generation of Muhammad's death Muslim armies occupied an empire stretching from the Nile river to the far off Iranian province of khorasan. Reasons for the rapid conquest are varied and obscure. The Arab armies were more akin to tribal war bands raiding and settling where and when they could. The Byzantine and Sassanid empires had been at war for centuries. The constant simmering conflict between Constantinople and Persia reached a climax in the early 7th century. The Sassanids conquered briefly Egypt and the Levant threatening the central Byzantine heartland of Anatolia. Under the military reforms of the emperor Heraclius, the Byzantine army consolidated and counterattacked, recapturing all that they had lost and capturing the Sassanian capital of Ctesiphon in 628.  

This brief end of the Roman-Persian wars disrupted the frontier areas which had predicated their economies on raiding and mercenary activities. Two major areas in Arabia were directly affected. The Lackmid tribe and the Gassanid tribe both acted as mercenaries for the Persians and Romans. The official religion of both tribes analogically mirrored that of their overseers. Monophysite Christianity was common, particularly of the Jacobite sect. The death of Muhammad and the subsequent Ridda wars occupied these warrior tribes until the reign of Caliph Umar. Additionally, there was great religious unrest in the levant and Egypt. These areas resented the ruinous taxes and the harsh orthodoxy imposed by the emperor in Constantinople.  

This brief end of the Roman-Persian wars disrupted the frontier areas which had predicated their economies on raiding and mercenary activities. Two major areas in Arabia were directly affected. The Lackmid tribe and the Gassanid tribe both acted as mercenaries for the Persians and Romans. The official religion of both tribes analogically mirrored that of their overseers. Monophysite Christianity was common, particularly of the Jacobite sect. The death of Muhammad and the subsequent Ridda wars occupied these warrior tribes until the reign of Caliph Umar. Additionally, there was great religious unrest in the levant and Egypt. These areas resented the ruinous taxes and the harsh orthodoxy imposed by the emperor in Constantinople.