Editing Sixth Crusade (section)

=== King of Jerusalem ===
Frederick II desired to go to the Holy Land as king of Jerusalem. He married John of Brienne's daughter [[Isabella II of Jerusalem#Marriage with Frederick II|Isabella II]] by proxy in August 1225 at Acre, presided over by Giacomo, the [[Roman Catholic Diocese of Patti#Diocese of Patti|bishop of Patti]]. In accordance with her father's wishes, she was crowned queen of Jerusalem a few days later at Tyre. Frederick sent fourteen galleys for her, under the command of admiral [[Henry, Count of Malta|Henry of Malta]], pardoned since his role at the [[Fifth Crusade#Disaster at Mansurah|disaster at Mansurah]] during the Fifth Crusade. They were formally married at [[Brindisi]] on 9 November 1227.{{sfn|Van Cleve|1969|pp=442|loc=Marriage to Isabella II}}

John and Frederick's relationship became frayed, as Frederick claimed the kingship of Jerusalem. John had allegedly been given assurances that he would be king of Jerusalem for the rest of his life. According to one version, John got into a disagreement with his new son-in-law because Frederick seduced a niece of Isabella who was her lady-in-waiting. In the other version of the chronicle, John often chastised his son-in-law, concluding that John wanted to seize Sicily for his nephew [[Walter IV, Count of Brienne|Walter IV of Brienne]]. Frederick declared that John had lost his claim to the kingdom when Isabella married him. He proclaimed himself king of Jerusalem for the first time in December 1225, taking the crown at a special ceremony at [[Foggia]].{{sfn|Runciman|1954|pp=175–177|loc=The Fate of John of Brienne (1225)}}

John of Brienne left for Rome, where Honorius sympathized with him, and ignored Frederick's claims. [[Balian Grenier|Balian of Sidon]], Simon of Maugastel, the [[See of Tyre#Latin archbishops of Tyre|archbishop of Tyre]], and the other Jerusalemite lords who had escorted Isabella to Brindisi acknowledged Frederick as their lawful king.{{sfn|Perry|2013|pp=135–136|loc=A decade in the West}} Notably, these did not include the [[House of Ibelin|Ibelins]]. Nevertheless, the law––the [[Assizes of Jerusalem]]––required that the monarch be a resident of the kingdom. Frederick's first royal decree was to bestow new privileges upon Hermann of Salza and the Teutonic Knights, placing them on equal footing as the Templars and Hospitallers. [[Thomas I of Aquino|Thomas of Aquino]], the emperor's long-time advisor, replaced Odo of Montbéliard as ''[[Officers of the Kingdom of Jerusalem#Bailiffs|bailli]]'' of the kingdom.{{sfn|Van Cleve|1969|pp=443–444|loc=Frederick as King of Jerusalem}}