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After Muhammad's death in 632, Islamic rule grew rapidly, encompassing what is now the Middle East, Egypt, North Africa, and Iran. Most of the new subjects were Christian, Jewish, and Zoroastrian, the first two being considered People of the Book. (After some argument, the Zoroastrians were considered People of the Book as well.) Christians, Jews, and Zoroastrians were called "dhimmi", protected persons. As noted above, they could worship, follow their own family law, and own property. People of the Book were not subject to certain Islamic rules, such as the prohibitions on alcohol and pork, but were subject to other restrictions. Under the Islamic state, they were exempt from military service, but were required to pay a poll tax known as "jizya". (They were, however, exempt from the "zakat" required of Muslims.) They could be bureaucrats and advisors, but they could never be rulers.