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Under Umar the Islamic empire expanded at an unprecedented rate ruling the whole Sassanid Persian Empire and more than two thirds of the Eastern Roman Empire. His legislative abilities, his firm political and administrative control over a rapidly expanding empire and his brilliantly coordinated multi-prong attacks against Sassanid Persian Empire that resulted in conquest of Persian empire in less than two years, marked his reputation as a great political and military leader. It was Umar who for the first time in 500 years since expulsion of Jews from the Holy Land, allowed them to practise their religion freely and live in Jerusalem. Religiously a controversial figure in the Muslim world, Umar is regarded by Sunni Muslims as one of four Rashidun or rightly guided caliphs who were true successors of Muhammad; in stark contrast, regarded by Shi'a Muslims as unjust in his usurpation of Ali's right to the caliphate, indeed as the principal political architect of opposition to Ali. |