In 1187,
Saladin conquered much of the Kingdom of Jerusalem (also called the
Latin Kingdom), including Acre and
Jerusalem, after winning the
Battle of Hattin and inflicting heavy losses on the Crusaders. The
Third Crusade was launched in response; the Crusaders
besieged and eventually recaptured Acre in 1191. Acre became the capital of the Kingdom of Jerusalem. The religious orders made their headquarters in and around the city, and from there made crucial military and diplomatic decisions. For example, when the
Mongols arrived from the East in the mid-13th century, the Christians saw them as potential allies. In 1250, the
Mamluk Sultanate arose in
Egypt; it was a more dangerous enemy than the
Ayyubids. The Mamluks fielded heavy cavalry – a match for the Crusader knights – and were much more hostile. The Crusaders initially attempted to maintain a cautious neutrality with the Mamluks. In 1260, the Barons of Acre granted the Mamluks safe passage through the Latin Kingdom en route to fighting the Mongols; the Mamluks subsequently won the pivotal
Battle of Ain Jalut in
Galilee against the Mongols. This was an example of atypically cordial relations between the Christians and the Mamluks. However, as early as 1261, after the Battle of Ain Jalut,
Sultan Baibars led the Mamluks against the Crusaders. Baibars captured
Caesarea,
Haifa, and
Arsuf in 1265, all the important Crusader holdings in Galilee the following year, and then
Antioch in 1268. European states launched a number of minor Crusading expeditions to reinforce the Crusader states, including the
abortive Crusade of
Louis IX of France to
Tunis in 1270, and the minor
Ninth Crusade of Prince Edward (later
King Edward I) of England in 1271–1272. The expeditions failed to provide the required relief; they were too small, too short-lived, and the interests of the participants were too diverse. in 1289 triggered frantic preparations to save Acre. More seriously, no major reinforcing Crusade was forthcoming.
Pope Gregory X was unable to rally support for another great Crusade. Papal advisors blamed the lack of enthusiasm to the laziness and vice of the European nobility and to clerical corruption. A more fundamental reason seems to have been the debasement of the Crusading ideal; Gregory X's predecessors had used Crusades to raise armies against the Papacy's European enemies, such as the
Albigensian Crusade declared by
Innocent III against the
Cathars & a crusade against the
Hohenstaufen Emperor Frederick II declared by
Innocent IV. The Crusader states continued to deteriorate from continuing attacks and political instability. In 1276, the unpopular "
King of Jerusalem"
Hugh III moved his court to
Cyprus. Under Sultan
Al-Mansur Qalawun, the Mamluks captured
Lattakia in 1278, and
conquered the
County of Tripoli in 1289. Qalawun concluded a ten-year truce with the Kingdom of Jerusalem in 1284. Following the fall of Tripoli, King
Henry II, son of Hugh III, sent
seneschal Jean de Grailly to warn European monarchs of the critical situation in the
Levant.
Pope Nicholas IV supported Jean by writing letters urging European potentates to act. However, the
Sicilian question overshadowed calls for a new Crusade, and Edward I of England was too entangled by troubles at home. Decades of communications between the Europeans and the Mongols failed to secure a meaningful
Franco-Mongol alliance.
Pretext for attack One Arab account claims that an affair between a rich young wife of the city and a
Mussulman was discovered by the husband: The Crusaders feared that Qalawun would use this as a pretext to resume the war, and petitioned the pontiff for reinforcements. According to Michaud, 25 Venetian galleys carrying 1600 men "levied in haste in Italy" were sent. The Italian reinforcements were ill-disciplined and without regular pay; they pillaged indiscriminately from both Muslims and Christians before setting out from Acre. According to Runciman they attacked and killed some Muslim merchants around Acre in August 1290, ==Siege==