Pope Leo II died on 683-06-28.
Pope Leo II was born in 611.
No, Leo II was pope in the years 682 and 683. The Crusades did not kick off until the year 1090.
Pope Leo I died on 461-11-10.
Pope Leo V died in 903.
Pope Leo the X.
Having consulted The Chronicle of the Popes, the Catholic Encyclopaedia, Wikipedia, and a book translated from the Italian on the Popes... No one seems to have recorded the manner of death of Pope St. Leo II.
Pope Leo III died on 816-06-12.
Pope Leo IV died on 855-07-17.
Pope Leo VII died on 939-07-13.
Pope John Paul II was the predecessor of Pope Benedict XVI.
Pope Leo XI died on April 27, 1605 at the age of 69.
Pope Leo XII died on February 10, 1829 at the age of 68.