Throughout the ages, many a Jewish community has encountered enemies comparable to the evil Haman of the Purim story. Sometimes the Jews succumbed to his persecutions, Rachamana litzlan; in other instances, there was a reversal of fortune, and they were saved. At such times, a Purim Katan, a local Purim, would be enacted. Its observance on that same date in future years would serve to commemorate their deliverance from impending disaster. Where the sequence of events rendered it appropriate, a day of fasting was instituted on the day previous to the new Purim.