"Stefan Uroš I (Serbian Cyrillic: Стефан Урош I; c. 1223 – May 1, 1277), known as Uroš the Great (Урош Велики)[a] was the King of Serbia ...
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from 1243 to 1276, succeeding his brother Stefan Vladislav. He was one of the most important rulers in Serbian history." - (en.wikipedia.org 31.01.2020)