While including the reconquests of Spain and Sicily, this usually referres to the military expeditions of the Roman Catholic Church to attempt to reclaim the Holy Lands in Palestine and Jerusalem from the Muslims. Urban II launced these holy wars in 1095 after the Councel of Clermont. The first of these holy wars was led led by French and Norman nobles, and succeeded in capturing Jerusalem and other major cities of the Holy Lands for about 100 years. During later military expeditions (5 total), the Muslims reclaimed the Holy Lands from the Europeans, and European forces were unable to reclaim it again. Consequences of these holy wars were an increase in communication between European and Muslim philosophers, increased trade between the two, and the integration of Europe into the Eurasian economy. Concepts and good such as "Arabic" numerals, paper production, spices, granulated sugar, and other goods were also introduce to Europe through Muslims.