The Conquest Of Persia, Syria, Egypt, Africa, And Spain, By The Arabs Or Saracens.—Empire Of The Caliphs, Or Successors Of Mahomet.—State Of The Christians, &c., Under Their Government. Chapter LII: More Conquests By The Arabs.—Part I. Part II. Part III. Part IV. Part V. 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. Chapter LIII: Fate Of The Eastern Empire.—Part I. Part II. Part III. Part IV. Fate Of The Eastern Empire In The Tenth Century.—Extent And Division.—Wealth And Revenue.—Palace Of Constantinople.— Titles And Offices.—Pride And Power Of The Emperors.— Tactics Of The Greeks, Arabs, And Franks.—Loss Of The Latin Tongue.—Studies And Solitude Of The Greeks. Chapter LIV: Origin And Doctrine Of The Paulicians.—Part I. Part II. Origin And Doctrine Of The Paulicians.—Their Persecution By The Greek Emperors.—Revolt In Armenia &c.—Transplantation Into Thrace.—Propagation In The West.—The Seeds, Character, And Consequences Of The Reformation. Chapter LV: The Bulgarians, The Hungarians And The Russians.—Part I. Part II. Part III. The Bulgarians.—Origin, Migrations, And Settlement Of The Hungarians.—Their Inroads In The East And West.—The Monarchy Of Russia.—Geography And Trade.—Wars Of The Russians Against The Greek Empire.—Conversion Of The Barbarians. Chapter LVI: The Saracens, The Franks And The Normans.—Part I. Part II. Part III. Part IV. Part V. The Saracens, Franks, And Greeks, In Italy.—First Adventures And Settlement Of The Normans.—Character And Conquest Of Robert Guiscard, Duke Of Apulia—Deliverance Of Sicily By His Brother Roger.—Victories Of Robert Over The Emperors Of The East And West.—Roger, King Of Sicily, Invades Africa And Greece.—The Emperor Manuel Comnenus.— Wars Of The Greeks And Normans.—Extinction Of The Normans. Chapter LVII: The Turks.—Part I. Part II. Part III. The Turks Of The House Of Seljuk.—Their Revolt Against Mahmud Conqueror Of Hindostan.—Togrul Subdues Persia, And Protects The Caliphs.—Defeat And Captivity Of The Emperor Romanus Diogenes By Alp Arslan.—Power And Magnificence Of Malek Shah.—Conquest Of Asia Minor And Syria.—State And Oppression Of Jerusalem.—Pilgrimages To The Holy Sepulchre. Chapter LVIII: The First Crusade.—Part I. Part II. Part III. Part IV. Part V.