Sixth Crusade
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The Sixth Crusade started in 1228 as an attempt to reconquer Jerusalem. It began only seven years after the failure of the Fifth Crusade.
Frederick II, Holy Roman Emperor, had involved himself broadly in the Fifth crusade, sending troops from Germany, but he failed to accompany the army directly, despite the encouragement of Honorius III and later Gregory IX, as he needed to consolidate his position in Germany and Italy before embarking on a crusade. However, Frederick again promised to go on a crusade after his coronation as emperor in 1220 by Pope Honorius III.
In 1225 Frederick married Yolande of Jerusalem (also known as Isabella), daughter of John of Brienne, nominal ruler of the kingdom of Jerusalem, and Maria of Montferrat. Frederick now had a claim to the truncated kingdom, and reason to attempt to restore it. In 1227, after Gregory IX became pope, Frederick and his army set sail from Brindisi for Acre, but an epidemic forced Frederick to return to Italy. Gregory took this opportunity to excommunicate Frederick for breaking his crusader vow, though this was just an excuse, as Frederick had for years been trying to consolidate imperial power in Italy at the expense of the papacy. Further to this, Gregory had stated that the reason for the excommunication was Frederick's repeated delays to going on crusade, which had started as far back as the Fifth crusade. It is clear that for Gregory, the crusade was just a useful excuse to excommunicate the emperor, whose Italian ambitions he feared. Frederick attempted to negotiate with the pope, but eventually decided to ignore him, and sailed to Syria in 1228 despite the excommunication, arriving at Acre in September.
Instead of heading straight for the Holy Land, Frederick first sailed to Cyprus, which had been an imperial fiefdom since the capture of Richard the Lionheart during his return from the Third Crusade. The emperor arrived with the clear intent of stamping his authority on the kingdom, but was treated cordially by the native barons until a dispute arose between him and the bailli of Cyprus, John of Ibelin. Frederick claimed that his regency was illegitimate and demanded the surrender of John's mainland fief of Beirut to the imperial throne. However, here he erred, for John pointed out that the kingdoms of Cyprus and Jerusalem were constitutionally separate and he could not be punished for offences in Cyprus by seizure of Beirut. This would have important consequences for the crusade, as it alienated the powerful Ibelin faction against the emperor, though John maintained a careful air of respect whilst Frederick remained in the East.
Acre, as the nominal capital of the Kingdom of Jerusalem and the seat of the Latin Patriarchate, was split in its support for Frederick. Frederick's own army and the Teutonic Knights supported him, but Patriarch Gerald of Lausanne (and the clergy) followed the hostile papal line. Once news of Frederick's excommunication was spread, public support for him waned considerably. The position of the Knights Hospitaller and Knights Templar is more complicated, as though they refused to join the emperor's army directly, they gave their support to the crusade when Frederick agreed to have his name removed from official orders. The native barons greeted Frederick enthusiastically at first, but were wary of the emperor's history of centralization and his desire to impose imperial authority. This was largely due to Frederick's treatment of John of Ibelin in Cyprus, and his apparent disdain for the constitutional concerns of the barons.
Even with the Military Orders on board, Frederick's force was a mere shadow of the army that had ammassed when the crusade had originally been called. He realised that his only hope of success in the Holy Land was to negotiate for the surrender of Jerusalem as he lacked the manpower to engage the Ayyubid empire in battle. Frederick hoped that a token show of force, a threatening march down the coast, would be enough to convince al-Kamil, the sultan of Egypt, to honor a proposed agreement that had been negotiated some years earlier, prior to the death of al-Muazzam, the governer of Damascus. The Egyptian sultan, occupied by the suppression of rebellious forces in Syria, agreed to cede Jerusalem to the Franks, along with a narrow corridor to the coast. In addition, Frederick (certainly) received Nazareth, Sidon, Jaffa and Bethlehem. Other lordships may have been returned to Christian control, but sources disagree. It was however, a treaty of compromise. The Muslims retained control over the Temple Mount area of Jerusalem, the al-Aqsa mosque and Dome of the Rock. The Transjordan castles stayed in Ayyubid hands and the Arab sources suggest that Frederick was not permitted to restore Jerusalem's fortifications. The treaty, completed on February 18, 1229 safeguarded a truce of ten years, the maximum Islamic law permitted with an 'infidel'.
Frederick entered Jerusalem on 17 March, 1229 and attended a crown-wearing ceremony the following day. It is unknown whether he intended this to be interpreted as his official coronation as King of Jerusalem, in any case the absence of the patriarch, Gerald, rendered it illegitimate. There is evidence to suggest that the crown Frederick wore was actually the imperial one ('Crusading and the Crusader States', Jotischky, (Edinburgh, 2004), p.225), but in any case it was a provocative act proclaiming his lordship over Jerusalem. Legally, however, he was actually only regent for his son Conrad II of Jerusalem, only child of Yolande and the grandson of Maria of Montferrat and John of Brienne, who had been born shortly before Frederick left in 1228.
As Frederick had other matters to attend to at home, he left Jerusalem in May. It took a defeat in battle later in 1229 for the Pope to lift the excommunication, but by now Frederick had shown that a crusade could be successful with neither military engagements nor support from the papacy. The truce, hugely unpopular since its inception, expired in 1239 and Jerusalem was taken by the Mamluks in 1244,[citation needed] but now that Frederick had set the precedent, further crusades would be launched by individual kings such as Louis IX of France (the Seventh and Eighth Crusades) and Edward I of England (the Ninth Crusade) without papal involvement.
