He built, and in 1382 opened the ports of Brstanik near Počitelj and Sveti Stefan, now known as Herceg Novi in Bay of Kotor Monte Negro as a line of defence from Dubrovnik and Kotor.
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Finally his forces reached Vrane and freed the rebels from the Hungarian rule that were being besieged there.
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The ceremony took place in December 1374 in Saint Ilija (today's Ilinci) near Šid.
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Horvat's ally was Elizabeth's first cousin, King Tvrtko I of Bosnia, who appointed him and his brothers governors of Usora.
From 1324 to 1326 this part of Hum was occupied by Bosnia's Ban Stjepan II Kotromanić, whose heir Tvrtko I had by 1373 extended the borders of the Bosnian state southwards to take in the whole of Hum.