 John was crowned emperor in Hagia Sophia in autumn 1231 ; by then , his territory was limited to Constantinople and its vicinity . The Venetians urged him to wage war against John III Vatatzes , Emperor of Nicaea , who supported a rebellion against their rule in Crete . According to Philippe Mouskes ' Rhymed Chronicle , John could make " neither war nor peace " ; because he did not invade the Empire of Nicaea , most French knights who accompanied him to Constantinople returned home after his coronation . To strengthen the Latin Empire 's financial position , Geoffrey II of Achaea ( John 's most powerful vassal ) gave him an annual subsidy of 30 @,@ 000 hyperpyra after his coronation . 
 John was crowned emperor in Hagia Sophia in autumn 1231 ; by then , his territory was limited to Constantinople and its vicinity . The Venetians urged him to wage war against John III Vatatzes , Emperor of Nicaea , <a href='null_relcl' title='1'><mark>who</mark></a>supported a rebellion against their rule in Crete . According to Philippe Mouskes <a href='null_genetive' title='2'><mark>'</mark></a>Rhymed Chronicle , John could make " neither war nor peace " ; because he did not invade the Empire of Nicaea , most French knights <a href='null_relcl' title='3'><mark>who</mark></a>accompanied him to Constantinople returned home after his coronation . To strengthen the Latin Empire <a href='null_genetive' title='4'><mark>'s</mark></a>financial position , Geoffrey II of Achaea ( John <a href='null_genetive' title='5'><mark>'s</mark></a>most powerful vassal ) gave him an annual subsidy of 30 @,@ 000 hyperpyra after his coronation . 
John was crowned emperor in Hagia Sophia in autumn 1231 ; by then , his territory was limited to Constantinople and its vicinity . The Venetians urged em to wage war against John III Vatatzes , Emperor of Nicaea , supported a rebellion against their rule in Crete . According to Philippe Mouskes  Rhymed Chronicle , John could make " neither war nor peace " ; because he did not invade da Empire of Nicaea , most French knights accompanied hemto Constantinople returned home after his coronation . To strengthen the Latin Empire  financial position , Geoffrey II of Achaea ( John  most powerful vassal ) gave hiemn annual subsidy of 30 @,@ 000 hyperpyra after his coronation .