"Religion, and it can merge into nationalism as orthodoxy does with the Serbs and the Russians, offers both a cause worth dying for and the promise of eternal life. The crusaders did not leave their homes all over Europe and make the long and dangerous journey to the Holy Land just to acquire loot and land. There was more and better to be had much closer to home. They were driven by what they thought was a divine mission, to retrieve the land where Christ had once lived for Christendom. Many crusaders – kings such as Richard I of England, the Lionheart, and Philip II of France and great landed magnates – left behind properties, position and families and many never returned. Egged on by religious leaders such as Pope Gregory VII, who reminded the faithful of the passage from the Book of Jeremiah ‘Cursed be he that keepeth back his sword from blood’, they killed indiscriminately those they thought of as infidels. In the massacres in Jerusalem in 1099 the streets were said to have run with blood, in some places up to the knees of the crusaders’ horses. ‘None of them were left alive; neither women nor children were spared,’ said a contemporary account."