Mansa Musa was the ruler of _____(Mali,Ghana,or Songhai?). He was a devout Muslim, and he took a journey - called a hajj - to the city of______(Mecca,Medina,or Jerusalem?). All Muslims are required to make the hajj (every year, on their twenty-first birthday, or once in their lifetime?). The hajj is one of the_____(Three, Five, seven?)Pillars of Islam.