Just seventy-three years after Yarmuk, all ancient Christian lands between Greater Syria to the east and Mauretania (Morocco) to the west—approximately 3,700 miles—were forever conquered by Islam. Put differently, two-thirds (or 66 percent) of Christendom’s original territory†—including three of the five most important centers of Christianity—Jerusalem, Antioch, and Alexandria‡—were permanently swallowed up by Islam and thoroughly Arabized.
