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

Chapter LII: More Conquests By The Arabs

The Two Sieges Of Constantinople By The Arabs.—Their Invasion Of France, And Defeat By Charles Martel.—Civil War Of The Ommiades And Abbassides.—Learning Of The Arabs.— Luxury Of The Caliphs.—Naval Enterprises On Crete, Sicily, And Rome.—Decay And Division Of The Empire Of The Caliphs. —Defeats And Victories Of The Greek Emperors.