Romanesque art developed in Europe during the Middle Ages between the 10th and 12th centuries. It was characterized by thick walls, small round-arched windows, heavy rounded arches, barrel or groin vaults, and the use of trabeation. The style expanded across Europe through the growth of pilgrimage routes and trade, as well as the establishment of monasteries, churches, and castles during this period. The Romanesque style exhibited regional variations across countries like France, Italy, England, Germany, and Spain.