The original monastery was not preserved. Persians destroyed the monastery during their invasion in 614 A.D. as almost all Christian institutions in the Holy Land. Only at the time of the Crusaders, next to the historical monastery called "Kalamon" (Good Shelter), the Christian presence was restored. The buttresses in the northern outer wall of the modern monastery are the evidence for this. The monastery located near the vital road along the Jordan River played a defensive role during the time of the Crusaders and controlled the entire region. Most likely that the activities of Raynald of Châtillon, Lord of Transioradan, during the reign of Guy de Lusignan, led to a particularly fierce confrontation with Muslims caused the monastery to fall, as did the crusader fortress Vadum Jacob. In wars with Muslims and futile attempts to threaten Mecca, Raynald of Châtillon even ferried ships across the Dead Sea to the Arava Valley and dragged them further to the Red Sea. Raynald's vigorous and aggressive activity strengthed the position of Salah ad-Din, which put an end to the first kingdom of the Crusaders in the Holy Land and destroyed the fortress on the site of the modern monastery of Gerasimus of Jordan.