The victory of Saladin at Hattin in 1187 put the quietus on religious life, cenobitical and eremitical, in Palestine.
Saladin and Guy of Lusignan after Battle of Hattin
So After Hattin, the eremitical life in the open countryside became difficult, if not impossible, for Latins. One place remained where hermits might follow their vocation undisturbed: Mount Carmel until the end of the kingdom lay within the sphere of Frankish power.
Carmel offered an ideal setting for retirement and reflection. Its rugged slopes, dense with vegetation; its remote valleys and wide views over the blue Mediterranean or the hills of Galilee, beckon to prayer and contemplation.
De Vitry would seem to indicate that western hermits settled on Mount Carmel from the beginning of the Frankish conquest of Palestine, yet indisputable evidence occurs only in the 13th century.