The basilica of San Domenico is one of the most important places of worship in Bologna, the main seat of the order of preaching friars. In the church, inside the Arca di San Domenico (work by Nicola Pisano and pupils, with contributions from Niccolò dell'Arca, Michelangelo Buonarroti, Alfonso Lombardi and Jean-Baptiste Boudard), the remains of San Domenico, founder of the 'order.