History of the Crusades (external link)
Chronology of Crusades (Knights Templar website)
Frankish Empire (c800CE)
Crusader States
Crusader Jerusalem
Franciscan website
Catholic Encyclopedia
Fulcher of Chartres' account of the conquest in 1099
Raymond d'Aguiliers' account of siege and conquest in 1099
Usama Ibn Munqidh (c. 1175) on the Franks
The Battle of Hattin (1187)
Roger of Hoveden: The Fall of Jerusalem in 1187
Internet Medieval Sourcebook on the Crusades
Hierosolyma of the Crusaders
Main Jerusalem Timeline > Hierosolyma

Hierosolyma, as the Latins call it, is at the heart of pope Urban II.'s call to liberate the holy places from the "infidels."
Frank (French) nobles take up the cross in form of the sword. When they finally arrive at the Holy City, the Crusaders slaughter its non-Christian population. The Dome of the Rock is now the templum salomonis, its subterranean colonades the "stables of Solomon," the city a virtual ghost town baptized in blood.