Built in the first half of 1100, in 1300 Giovanni da Campione added the Gothic porticoes. Since 1449 it has been managed by the Congregation of Mercy on behalf of the city, which has patronage over the structure. Inside, visitors can admire frescoes, stucco work, tapestries and wood inlays by Lotto. Musical masters such as Simone Mayr, Donizetti's tutor (both buried in the Basilica), have directed the old chapel.