The History of the Decline and Fall of the Roman Empire, by Edward Gibbon

Chapter LIX: The Crusades

Preservation Of The Greek Empire.—Numbers, Passage, And Event, Of The Second And Third Crusades.—St. Bernard.—Reign Of Saladin In Egypt And Syria.—His Conquest Of Jerusalem.—Naval Crusades.—Richard The First Of England.—Pope Innocent The Third; And The Fourth And Fifth Crusades.—The Emperor Frederic The Second.—Louis The Ninth Of France; And The Two Last Crusades.—Expulsion Of The Latins Or Franks By The Mamelukes.