There were eight or nine crusades, though only the first four were of any importance. The Crusades were Christian military expeditions mounted to wrest the Holy Land from the Muslims who had conquered it.
Answer:
c: The Sumerians among the first writings of any kind c. 3500 BCE
Explanation:
Sumer or Sumeria is still thought to be the birthplace of slavery, which grew out of Sumer into Greece and other parts of ancient Mesopotamia.
