In 622, Muhammad emigrated to Yathrib, a predominantly Jewish oasis, with his small band of 150 followers.
CENTERFORSECURITYPOLICY: Geert Wilders in Berlin
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There were a few agricultural colonies on the higher ground, such as Ta'if, which supplied Mecca with most of its food, and Yathrib, some 250 miles to the north.
NPR: Armstrong, 'Muhammad: A Prophet for Our Time'