 John went to France to recruit warriors to accompany him to Constantinople . Pope Gregory did not proclaim John 's expedition to the Latin Empire a crusade , but promised papal privileges granted to crusaders to those who joined him . During his stay in France , John was again an intermediary between local potentates and signed a peace treaty between Louis IX of France and Hugh X of Lusignan . He returned to Italy in late 1230 . John 's envoys signed a treaty with Jacopo Tiepolo , Doge of Venice , who agreed to transport him and his retinue of 500 knights and 5 @,@ 000 commoners to Constantinople in return for John 's confirmation of Venetian possessions and privileges in the Latin Empire . Shortly after John left for Constantinople in August , Pope Gregory acknowledged Frederick II 's claim to the Kingdom of Jerusalem . 
 John went to France to recruit warriors to accompany him to Constantinople . Pope Gregory did not proclaim John <a href='null_genetive' title='1'><mark>'s</mark></a>expedition to the Latin Empire a crusade , but promised papal privileges granted to crusaders to those <a href='null_relcl' title='2'><mark>who</mark></a>joined him . During his stay in France , John was again an intermediary between local potentates and signed a peace treaty between Louis IX of France and Hugh X of Lusignan . He returned to Italy in late 1230 . John <a href='null_genetive' title='3'><mark>'s</mark></a>envoys signed a treaty with Jacopo Tiepolo , Doge of Venice , <a href='null_relcl' title='4'><mark>who</mark></a>agreed to transport him and his retinue of 500 knights and 5 @,@ 000 commoners to Constantinople in return for John <a href='null_genetive' title='5'><mark>'s</mark></a>confirmation of Venetian possessions and privileges in the Latin Empire . Shortly after John left for Constantinople in August , Pope Gregory acknowledged Frederick II <a href='null_genetive' title='6'><mark>'s</mark></a>claim to the Kingdom of Jerusalem . 
John went to France to recruit warriors to accompany him to Constantinople . Pope Gregory did not proclaim John  expedition to da Latin Empire a crusade , but promised papal privileges granted to crusaders to those joined em . During his stay in France , John was again an intermediary between local potentates and signed a peace treaty between Louis IX of France and Hugh X of Lusignan . He returned to Italy in late 1230 . John  envoys signed a treaty with Jacopo Tiepolo , Doge of Venice , agreed to transport him and his retinue of 500 knights and 5 @,@ 000 commoners to Constantinople in return for John  confirmation of Venetian possessions and privileges in tdaLatin Empire . Shortly after John left for Constantinople in August , Pope Gregory acknowledged Frederick II  claim to thdaingdom of Jerusalem .