الحاكم بأمر الله
In 603, Pope Gregory I commissioned the Ravennate Abbot Probus, who was previously Gregory's emissary at the Lombard court, to build a hospital in Jerusalem to treat and care for Christian pilgrims to the Holy Land. In 800, Charlemagne enlarged Probus' hospital and added a library to it, but it was destroyed in 1005 by Al-Hakim bi-Amr Allah along with three thousand other buildings in Jerusalem.