The general aim of the Crusade proclaimed by Urban II - to liberate Jerusalem and destroy the infidels - came up against hard realities. The crusaders managed to conquer the Holy City, the Moslems abandoned Jerusalem and other conquered cities but they did not abandon their farms and villages. On the eve of the First Crusade the majority of the population of Syria and Palestine was Moslem. The European conquerors were not more than a minority in the seized region. The Franks neither became a majority in the territories they seized, nor merged with the native population. But finally the Frankish seigneurs managed to establish a modus vivendi with the Muslim subjects and created a special type of heterogeneus society that had no antecedents in medieval European experience. The aim of the paper is to analize how the contemporary latin chroniclers of the first decades of the Kingdom of Jerusalem described the Muslim subjects and their status during the reign of Baldwin I.