During a massacre in this city, Cardinal John was beheaded and his head dragged through the street by a dog. According to Robert of Clari, Philip of Swabia was inspired to lay siege to this city after receiving the son of a deposed monarch. After a siege that captured this city’s Blachernae (“bla-CAIR-nay”) neighborhood, (10[1])Baldwin IX was (10[1])crowned, (10[1]-5[2])beginning (10[1]-5[4])this (-5[2])city’s (10[2]-5[2])Frankokratia. (10[1]-5[6])The (10[1])neighboring (10[3])town (10[1])of Galata (10[5]-5[2])was used (-5[1])to stage (10[2])an invasion (10[3])of this (10[2])city (10[2])by Boniface (-5[1])of Montferrat. The Empire of Trebizond was created (10[1])after (10[2])that (10[1])sack, (10[2])which was partly (10[3])prompted by (10[1])unpaid (10[1])debts (10[1])to (10[1])Enrico Dandolo. (10[2])The Latin Empire (10[4]-5[2])was established (10[1])after a (-5[1])siege (10[1])of this city that (10[1])included the landing of soldiers on this city’s Golden Horn. (10[5])For 10 points, (10[1])the Fourth (10[2])Crusade sacked (10[1])what capital (10[1])of the Byzantine (10[3])Empire? (10[1])■END■ (10[15])