 Archbishop Borromeo had the chapel of St Genesius rededicated to St Aquilino, whose relics were placed in the chapel; to its sides were added two chapels, dedicated to St John the Baptist and the Holy Family.In 1623, at the wish of Archbishop Federico Borromeo there began the construction of the chapter house to the side of the courtyard, a project carried out by the architects Aurelio Trezzi and Francesco Maria Richino; construction was completed in 1626.In 1713 at the initiative of Francesco Croce, the Chapel of Redemption was inserted between those of St Aquilino and the Holy Family (now a sacristry).