Notes
First, unification of Syria under Zengi of Aleppo and son Nur al-Din. Then unification of Syria with Egypt under Kurdish mercenary commander turned sultan, Saladin who secures the three inland muslim capitals of Damascus, Aleppo and Mosul, and only then turns his armies on the Franks. Decks war with language of jihad, but then suppresses heritical Fatimid Caliphate in 1171. Internal maintenance of empire is the main concern, so partition of Palestine with Franks is pragmatic.
Third Crusade by Richard takes back Jaffa, Acre from Saladin, gets treaty allowing pilgrims free access to Jerusalem
Saladin’s successors the Ayyubids successfully resist Christian attacks, but the role of Mamluks in defending Egypt in 1250 seal their succession.
Fourth Crusade by Innocent II has no kings, only nobles who must fund their campaign through Venetian doge Enrico Dandolo. Unable to pay, so Enrico agrees moratorium on debt if crusaders capture for him the Dalmatian port of Zara from fellow crusader Emeric of Hungary. Then, crusaders dragged into politics of Alexius IV, son of deposed Byzantine emperor Isaac II, siege Constantinople driving out Alexius III.
Greeks are alienated, Alexius V deposes and murders the 2 emperors, so crusaders breach the city and partition the kingdom. Byzantium now a latin state under Baldwin of Flanders. Venetians have moved from commercial to territorial imperialism.
Capture of Byzantium no accident, many popes annoyed by Greek failure to contribute to the 3 crusades before.
Fifth Crusade 1213-29 reflects the instituionalization of crusading, semi-permanent evangelization. Bull Quia Maior launches - remission of sins, indulgence for money or fighting. Fourth Lateran Council in 1215 authorizes universal clerical taxation. This time, bulk of recruits from Germany, C.Europe, Italy and Britain rather than France.
Focus on Egypt - siege of Damietta. Moves south to Cairo, cut off by floods, surrenders. Frederick II in 1229 exploits rivalries between Egypt/Syria to settle treaty with sultan of Egypt restoring Jerusalem to the Franks. City open to all, Haram al-Sharif the Temple Mount still under Islamic religious authority (similar to arrangement in 1967). Khwarazmian raiders and Turkish freebooters under pay by sultan of Egypt take back in 1244, remains under Muslim rule till 1917.
Mamluks replace heirs of Saladin in Egypt 1250s, professional caste of Turk slave warriors. Franks ally with Mongols, but Mongols beaten by Mamluks. Final loss of Christian outposts in Syria and Palestine in 1291. Antioch in 1268. Tripoli 1289. Acre 1291. All ports levelled.
Louis IX captures Damietta 1249. Assault on interior disintegrates through disease, fatigue. Louis captured, gives back Damietta and msasive ransom.
Innocent III declares war against Cathar heretics (Albigensians) 1208, goes from cauterizing heresy to brutal land seizure - offers Holy Land indulgences to northern French barons. Used similarly against Henry VIII, Elizabeth I, and French Hugueonots. Causes the Thirty Years War with Hohenstaufen Frederick II that ends with papal nominee Charles of Anjou as ruler of Sicily and Naples.
Failure of crusades to end the Great Papal Schaism (1378-1417) led to abandonment of this form of holy war.
First Lateran Council 1123 extends privileges of expedition to Jerusalem to fighting the Muslims in Spain. Crusades against Moors in 1147. Muslim fundamentalist Almohads from N.Africa attack Iberia, provoking more crusades. Spanish Reconquista - Balearics and Valencia by James I of Aragon. Cordova, Seville to Ferdinand III of Castile pens Moors in emirate of Granada until 1492.
Medieval world map shows Jerusalem at center, navel of the world (East to the bottom).