This scenario changed during the Renaissance of the 12th century. The intellectual revitalization of Europe started with the birth of medieval universities. The increased contact with the Islamic world in Spain and Sicily during the Reconquista, and the Byzantine world and Muslim Levant during the Crusades, allowed Europeans access to scientific Arabic and Greek texts, including the works of Aristotle, Alhazen, and Averroes. The European universities aided materially in the translation and propagation of these texts and started a new infrastructure which was needed for scientific communities.