Original: March 16 - A massacre and mass-suicide of the Jews of York, England, led by Richard Malebys, result in the deaths of 150 - 500 Jews in Clifford's Tower.
Simplified: Events March 16 - Massacre and mass-suicide of the Jews of York, England prompted by Crusaders and Richard Malebys kill 150 - 500 Jews in Clifford's Tower.