The increasing intercourse between Christians and Muslims, the growing appreciation on the part of the Crusaders of the virtues of their opponents, which so strikingly distinguishes the later from the earlier chroniclers of the Crusades,^[2] the numerous imitations of Oriental manners and ways of life by the Franks settled in the Holy Land, did not fail to exercise a corresponding influence on religious opinions.

One of the most remarkable features of this influence is the tolerant attitude of many of the Christian Knights towards the faith of Islam—an attitude of mind that was most vehemently denounced by the Church.

When Usāma b. Munqidh, a Syrian Amīr of the twelfth century, visited Jerusalem, during a period of truce, the Knights Templar, who had occupied the Masjid al-Aqṣā, assigned to him a small chapel adjoining it, for him to say his prayers in, and they strongly resented the interference with the devotions of their guest on the part of a newly-arrived Crusader, who took this new departure in the direction of religious freedom in very bad part.^[3]

It would indeed have been strange if religious questions had not formed a topic of discussion on the many occasions when the Crusaders and the Muslims met together on a friendly footing, during the frequent truces, especially when it was religion itself that had brought the Crusaders into the Holy Land and set them upon these constant wars.

When even Christian theologians were led by their personal intercourse with the Muslims to form a juster estimate of their religion, and contact with new modes of thought was unsettling the minds of men and giving rise to a swarm of heresies, it is not surprising that many should have been drawn into the pale of Islam.^[4]

The renegades in the twelfth century were in sufficient numbers to be noticed in the statute books of the Crusaders, the so-called Assises of Jerusalem, according to which, in certain cases, their bail was not accepted...^[5]

The heroic life and character of Saladin seems to have exercised an especial fascination on the minds of the Christians of his time; some even of the Christian knights were so strongly attracted towards him that they abandoned the Christian faith and their own people and joined themselves to the Muslims; such was the case, for example, with a certain English Templar, named Robert of St. Albans, who in A.D. 1185 gave up Christianity for Islam and afterwards married a grand-daughter of Saladin.^[6]