Aragon is one of the autonomous communities of Spain. Zaragoza is the largest city in the region of Aragon. Two important churches in Zaragoza are the Basilica-Cathedral of Our Lady of the Pillar, reputed to be the first church dedicated to Mary, and La Seo Cathedral, located on the site of the ancient Roman forum. Zaragoza also has a rich history dating back to Roman times and was influenced by Mudejar architecture. An important local festival celebrated in October includes parades with giant figures called gigantes.