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In page Medina:

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After defeating his Saudi foes, Muhammad Ali took over governance of Medina and although he did not formally declare independence, his governance took on more of a semi-autonomous style. Muhammad's sons, Towson and Ibrahim, alternated in the governance of the city. Ibrahim renovated the city's walls and the Prophet's Mosque. He established a grand provision distribution centre (taqiyya) to distribute food and alms to the needy and Medina lived a period of security and peace.[citation needed] In 1840, Muhammad moved his troops out of the city and officially handed the city to the central Ottoman command.[1]