 The largest Bedouin clan in Syria is called Ruwallah who are part of the 'Anizzah' tribe.Another famous branch of the Anizzah tribe is the two distinct groups of Hasana and S'baa who largely arrived from the Arabian peninsula in the 18th century.Herding among the Bedouin was common until the late 1950s, when it effectively ended during a severe drought from 1958 to 1961.