Jerusalem: The Biography

* 70,000 is the traditional figure for Jerusalem’s population but this is an implausible exaggeration. In the eleventh century, Constantinople had 600,000 inhabitants; Baghdad and Cairo, the great cities of Islam: 400,000–500,000; Rome, Venice and Florence 30,000–40,000; Paris and London 20,000. As for the Greek Fire, ‘God’s flame’, a petroleum-based concoction fired through siphons, had once saved Constantinople. Now the Muslims, not the Christians, had it.