The ancient oratory of the Holy Crucifix is a small artistic jewel of the Lombard fifteenth century, miraculously saved from the building expansion of Segrate thanks to the love and perseverance of many (Segratese and not), but above all of the Martesana section of the WWF which from the 80s to the latest restorations of 2006 (redevelopment of the Cascina Ovi area) has dedicated itself incessantly to its protection. The church, of very simple architectural layout, consists of a quadrangular front room and an apse with a cross vault, completely frescoed. In addition to representing the oldest that exists in Segrate, it hides inside "a precious page of fifteenth-century Lombard painting" (S. Bandera). Other pictorial cycles are present, but the two most important are the Crucifixion (on the back wall) and the Risen Christ (on the apse vault) depicting the twelve apostles enclosed in medallion decorations with Christ in the center from which sinuous solar rays radiate. These fifteenth-century frescoes are attributed by the Superintendence for the Artistic Heritage of Milan to the workshop of a master very close to Cristoforo Moretti (whose activity is documented from 1451 to 1485), who specialized in similar compositions characterized by the pictorial representation of a crucifixion and busts (apostles or prophets) inserted in roundels. Examples of this school are found in the church of S. Siro alla Vepra and S. Vincenzo in Prato in Milan and S. Margherita in Casatenovo Brianza. This artist of Cremonese origin is remembered in some documents together with other more famous painters such as Foppa and the Bottega degli Zavattari. Some of his works can be found in other Italian cities and abroad, in the museums of Lille and Berlin.