欧洲国家的居民大多信奉基督教,英国、瑞典等许多国家的国旗都有十字图案,这与历史上十字军东征有关。十字军东征是西欧封建领主、意大利大商人和罗马天主教会对地中海东岸地区发动的侵略性军事远征,始于1095年。教皇乌尔班二世在法国南部克莱蒙召开宗教大会,以从异教徒手中夺回“圣地”耶路 The inhabitants of European countries mostly believe in the cross pattern of the national flags of many countries such as Christianity, Britain and Sweden, which are related to the historical Crusades. The Crusades were an aggressive military expedition by the Western European feudal lords, the Italian big merchants and the Roman Catholic Church on the eastern Mediterranean coast, starting in 1095. Pope Urband II convened a religious assembly in Clermont, southern France, to reclaim the “Holy Land” from the heathen