Bertrand de Thessy
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Bertrand de Thessy's election to the responsibility of Grand Master corresponds to the arrival of Holy Roman Emperor Frederick II in the Holy Land. He embarked at Brindisi on 28 June 1228 and, after a stay in Cyprus from July 21 to September 3 to settle the suzerainty on the island for his benefit, landed at Acre on September 7. Frederick had been excommunicated by pope Gregory IX on 29 September 1227 and had prohibited all Christians from all places where Frederick would set foot, asking the Latin patriarch Gérold of Lausanne to promulgate the sentence of excommunication and three military orders to deny him obedience. Thessy thus refused to recognize him as king of Jerusalem, followed in this regard by Pedro de Montaigu, master of the Templars. The Teutonic Knights under Hermann of Salza, unused to disobedience vis-à-vis a German sovereign, fully supported the emperor.
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The Sixth Crusade
Frederick led a small contingent south from Acre and in November 1228 took charge of Jaffa. He was followed by the Templars and the Hospitallers one day's journey back, respecting the pope's position. They also viewed Frederick's thusly engaging with the sultan al-Kamil in the midst of the troops negatively. Lacking a strong army, the emperor was not looking for confrontation but for negotiation which ended up being successful on 18 February 1229, resulting in Jerusalem, Bethlehem and Nazareth being returned to the Franks. This ten-year, six-month and ten-day peace treaty was to begin on 24 February 1229. In fact, it was on the parchment it was written than in reality, as the Muslims kept key strategic points. The emperor had achieved his goal, to return to Jerusalem and be crowned as king, which he did on 18 March 1229. Frederick ended up crowning himself, as no one wished to violate the papal orders. Returning to Acre in the face of hostility, he embarked for Italy on 1 May 1229.
Thessy, together with the Templars and the patriarch Gérold of Lausanne, representing the clergy of the Holy Land, refused to accept the treaty as the Principality of Antioch and the County of Tripoli were excluded from the considerations. No effort had been made to protect the interests of these Crusader states. A further problem was the decision to leave two Christian shrines to the Muslims––the Temple of Our Lord (Mosque of Omar) and the Temple of Solomon (al-Aqsa Mosque). In August 1229, Gregory IX issued a papal bull to the Latin patriarch directing that the Hospitallers maintain jurisdiction over the Teutonic Knights, in punishment for their following Frederick.
After the Crusade
The Hospitallers and Templars took advantage of the fact that they were excluded from the treaty and, in the fall of 1229, led a successful incursion into the north of the country against the Muslims of the fortress of Montferrand and a disastrous expedition to Hama in July and August 1230. Hope returned when Frederick obtained from the pope relief from his excommunication on 28 August 1230 at the Treaty of Ceprano, and he returned to the Hospitallers and the Templars the goods confiscated in Sicily. Thessy died at Acre in 1231. He was succeeded by Guérin Lebrun as early as 1230 and at most at some time prior to 1 May 1231.