The complex is composed by two churches. The left one is the most ancient, which is known to be a Romanesque reconstruction of a far more ancient edifice. The Romanesque edifice was again rebuilt in the 13th century, when the Naviglio Grande was excavated. In the mid-14th century it received the Gothic portal and rose window. The Gothic church was flanked by a hospital, built around 1364. The more recent church, which currently is united to the other and gives the appearance of a single edifice, was constructed along the naviglio bank in the 15th century, and then called Ducal Chapel. It was commissioned by Duke Gian Galeazzo Visconti in order to provide a holy edifice and dedicated to St Christopher, the protector of ill people. The intercession of St Christopher was said to have ended the onslaught of the plague during 1399, that had killed some 20,000 Milanese. The Chapel was also dedicated to the Saints John the Baptist and James, Blessed Christina, all protectors of the House of Visconti. The façade sports the Visconti coat of arms, while the older church has the heraldic symbols of Cardinal Pietro Filargo, then bishop of Milan and later pope as Alexander V. In 1405 the counterfaçade of the Ducal Chapel was decorated with a Madonna Enthroned and Saints and a Crucifixion inspired by that in San Marco of Milan.
Architecture and art
The Romanesque church is a small hall ending with a small semicircular apse. The façade has a richly decorated brickwork portal with a Gothic rose window. The façade of the Ducal Chapel has a simple portal flanked by Gothic mullioned windows, according to a model established by Guiniforte Solari, and traces of frescoes of Saints from the 15th century. The current bell tower is a 15th-century enlargement of the original one, with conical cusp and mullioned windows. The interior, turned into two naves in 1625 with the demolition of the wall separating the two churches, has a wooden ceiling in the left nave with fragments of frescoes by Bergognone on the wall. The apse houses frescoes of Bernardino Luini's school, portraying the Father with Angels and the symbols of the Evangelists, and Saints. The right nave has two spans with Gothic frescoes on the walls. There are also a notable wooden statue representing St. Christopher and the Child.
