The church of S. Ambrogio in Redecesio is the last of the four oratories in the territory of Segrate to be restored (2010). The old decorated plasters and the precious wooden crucifix were thus brought to light. On this small church owned by the Humiliati then passed to the Major Seminary of Milan there are not many the documents that testify to it. The old decorated plasters and the precious wooden crucifix were thus brought to light. On this small church owned by the Humiliati then passed to the Major Seminary of Milan there are not many the documents that testify to it. Recent research dates the first attestation back to 1258 as an employee of the "Domus Portae Horientalis" in Milan. (The "Domus Humiliatorum in Milan in Porta orientale. First census sec. XIII – XV." Degree thesis Dr. Chiara Tangari, 1998) Other traces can be found in the acts of the pastoral visits of 1569 and 1571, when Cardinal Carlo Borromeo exhorted the inhabitants to enlarge the church so that it would be able to provide for the needs of souls. Other traces can be found in the topographic maps (sec. XVI - XVII) of the Archiepiscopal Curia of Milan in which the only ancient plan that has come down to us is drawn. The plan of the church was accompanied by a brief description: "it is a chapel under the care of segrato caspo de pieve... at the entrance of it is flat, and, bucketed (with the roof) a single ship. The chapel is in one vault without a Sky Head... it has two windows, one facing north and the other towards noon, there is no bell tower, but the bell placed above the door to the west of the plan can be seen that it borders the cemetery". It has also been told of the existence of a tunnel connecting the church and the Fra di Sesto farmhouse that belonged to the Umiliati, but during the recent restorations and the works of the new residential settlement behind the church no trace of it was found.