The third Holy Year celebrated by Boniface IX in the year 1390
In 1389, in his bull Salvator noster Unigenitus, Pope Urban VI reduced the interval between jubilees to 33 years, in reference to the number of years Christ lived on earth. He also confirmed the decision taken by Gregory XI (1373) to include Saint Mary Major among the basilicas to visit in jubilee years. Urban VI died a few months before the start of ceremonies for the 1390 jubilee, which was celebrated by his successor Boniface IX.
Domenico Maria Manni, Istoria degli anni santi dal loro principio sino al presente del MDCCL, tratta in gran parte da quella del p.l.f. Tommaso Maria Alfani..., Firenze 1750