Pope Gregory VII may have humiliated the Emperor Henry IV, as Innocent III later humiliated Philip Augustus of France and King John of England.

ECONOMIST: Medieval history

The Army has indicated that the procurement of additional Mi-17 for the Afghan military may be required, with Gregory telling Ria Novosti that it is up to 30.

FORBES: Sorry Congress, Defense Dept Sticking With Russian Helicopter Deal

The Christian holiday of All Hallows' Eve, celebrated on the same date, was originally celebrated on May 13, and was moved to its present date by Gregory III in the eighth century.

CNN: Happy Halloween