King Henry I explained to Pope Calixtus II in 1119 that he had afforded his captive brother Duke Robert of Normandy good treatment because of his crusader status: “I have not kept him in irons like a captured enemy but have lodged him as a noble pilgrim in a royal castle.” Whether the hero of Antioch and Jerusalem appreciated such fraternal generosity over the twenty-eight years spent in his brother’s prisons must be debatable.
—Christopher Tyerman, God’s War: A New History of the Crusades, p. 249