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The relationship between Serbia and Hungary during the 12 th century can be characterized as allied and peaceful. However, at the end of the 12 th century, Hungary attacked the Serbian territory. The paper analyzes the letter sent by the emperor Isaac II to Pope Celestine III regarding the Hungarian attack on Serbia. We learn from it that the Byzantine Empire protected Serbia in such circumstances, with the claim that Serbia has been “under Romania from ancient times”. Also, since the letter was not dated, by internal analysis of the text we can conclude that it was composed in 1193, so the Hungarian attack could be dated from the end of 1192 until the middle of 1193 .

ON THE ATTACK OF THE HUNGARIAN KING BELA III ON SERBIA IN LIGHT OF THE LETTER OF EMPEROR ISAAC II TO POPE CELESTINE III