Saint Louis of Montfort, like all Catholic saints, considered the Black plague a divine chastisement: “Thus, in 1349, God punished the whole of Europe and sent the most terrible plague that had ever been known into every land. It started first in the east and spread throughout Italy, Germany, France, Poland and Hungary, bringing desolation wherever it came----for out of hundred men hardly one lived to tell the tale. Big towns, little towns, villages and monasteries were almost completely deserted during the three years that the epidemic lasted. catholictradition.org/Classics/secret-rosary4.htm