Algeria would become part of the islamic world when the first Muslim Arabs came to Algeria in the mid-7th century, resulting in many people converting to the new religion of islam. In the 11th century, the Arab tribes of Banu Hilal and Banu Sulaym were living between Tunisia and eastern Algeria (Constantois). The famous mathematician, Fibonacci (1170—1250) lived in Algeria as a teenager. This is where he learned the Hindu–Arabic numeral system. Algeria was made part of the Ottoman Empire in 1517. Enslavement of black people was practiced there as it was throughout the empire.