(Jan) 17. Our Lady of Peace, in Rome. In the year 1483, the Duke of Calabria having besieged Rome to revenge himself on Sixtus IV., for his having prevented him from
assisting the Duke of Ferrara against the Venetians, the Pontiff had recourse to the Queen of Heaven, and engaged by vow to build her a church under the title of Our Lady of Peace, if she would vouchsafe to deliver the city from the siege, and restore peace
to Italy. His prayer being heard, he accomplished his vow, and commenced a church, which was finished by his successor, Innocent VIII. (Gabriel Pennotus in hist. tripartita Canon. regul., 1. iii., cap. 33)
Image (click it to enlarge): Interior picture - Church of Our Lady of Peace, in Rome. Note: the work of the renowned Italian artist, Raphael, is on the
inside [wall] of the church.
Related Link: Overview of 17th c. Historical Calendar of the Feasts of the B.V.M.
Source: "Historical Calendar of the Feasts of the Blessed Virgin, With the Foundations and Churches Dedicated to Her",
from Abbé Orsini's work, "Life of the Blessed Virgin Mary, Mother of God", Imprimatur 1858 A.D.