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The Senussi or Sanusi are a Muslim political-religious tariqa (Sufi order) and clan in colonial Libya and the Sudan region founded in Mecca in 1837 by the Grand Senussi, the Algerian Muhammad ibn Ali as-Senussi. Senussi was concerned with what he saw as both the decline of Islamic thought and spirituality and the weakening of Muslim political integrity. The Senussi order has been historically closed to Europeans and outsiders, leading reports of their beliefs and practices to vary immensely. In 1879-80 Oskar Lenz led the first trans-Sahara expedition from Morocco to Senegal and became the fourth European to visit the fabled city of Timbuktu. The others being, Alexander Gordon Laing (1826), René Caillié (1828) and Heinrich Barth (1853). Timbuktu; Travel through Morocco, the Sahara and Sudan by Oskar Lenz, 1884.