Several civilizations flourished outside of Europe in 1050, including Muslim empires, India, China, West Africa, and the Americas. The Crusades began in 1095 when Pope Urban II called for knights to help capture Jerusalem from the Turks and restore it to Christian control. The First Crusade succeeded in taking Jerusalem in 1099. The Crusades continued sporadically over 200 years and had mixed results, introducing European goods and expanding trade, but also increasing tensions between Christian groups and Muslims.