Excessive Killing in the First Crusade and its Impact on Demographic Change in the Levant (490-521A.H1097-1127A.D.)

After the Levant was invaded by the Crusaders in the fifth and sixth centuries AH / eleventh and twelfth centuries AD, their intentions became clear and came contrary to what they claim are religious wars, so their first practices were the excessive killings they carried out against Muslims in the Levant in the First Crusade, As a result of the brutal killings and massacres committed by the Crusaders against the population in the areas they controlled, as well as the theft of their money of gold, silver, oils and grains, the population migrated from the cities controlled by the Crusaders towards Iraq, Aleppo and Damascus, in search of safety, and the researcher highlighted the health, social and economic conditions of people in the diaspora and their psychological and physical diseases, not to mention unemployment as a result of leaving their jobs, and these conditions had a role in the movement of clerics and urged people to Jihad against the Crusaders.