William II of Sicily
The massacre further worsened the image of the Byzantines in the West, and although regular trade agreements were soon resumed between Byzantium and Latin states, the underlying hostility would remain, leading to a spiraling chain of hostilities: a Norman expedition under William II of Sicily in 1185 sacked Thessalonica, the Empire's second largest city, and the German emperors Frederick Barbarossa and Henry VI both threatened to attack Constantinople.