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Emperor Isaac Angel's envoys demanded hostages and a commitment to cede part of future conquests from Barbarossa. Frederick sent ambassadors to the emperor, whom Angel ordered to be thrown into prison. Upon hearing this, Frederick broke off negotiations and led his army towards Constantinople, leaving devastation in his wake. At the end of November, the crusaders captured Adrianople. Only after this did Isaac enter into negotiations with him, and in January 1190, an agreement was reached. Frederick promised not to pass through Constantinople, for which the Byzantine emperor provided the Germans with food and promised to transport them across the strait.