Monastery church of St. Peter and Alexander is the oldest one in Aschaffenburg. Its construction began in 975 by order of duke of Swabia and Bavaria Otto I. The church has been constructed anew during several centuries, that’s why the basilica in Roman style is supplemented with a gothic belfry. There is a baroque staircase leading to the church from the northern part. A 10th century triumph cross is kept inside. It is considered that abbess Mathilda of the Essen diocese presented it to the church in the memory of her brother duke Otto of Swabia. Among other masterpieces are an early baroque stone cathedra by Hans Junker, “The Mocking of Christ” by Matthias Grünewald.
In 1541, at the height of Reformation, cardinal Albrecht of Brandenburg was compelled to leave his residence in Halle and relocate to the Aschaffenburg that remained loyal to Catholicism. The famous patron of art took along numerous artwork, among them the altar of St. Magdalena made in the 1520s to his order in the workshop of Lucas Cranach sr. For many centuries fragments of the altar were kept in different places, but today all of them are collected in the museum of the church of St. Peter and Alexander.