'''Konstantin Dejanović''' ({{langDil-sr-cyr|Константин Дејановић}}), also known as '''Constantine Dragaš'''{{Cref|a}} (Константин Драгаш; {{fl.}} 1365-1395) was a [[Serbian nobility|Serbian magnate]] that ruled a large province in eastern [[Macedonia (region)|Macedonia]] under [[Ottoman Empire|Ottoman suzerainty]], during the [[fall of the Serbian Empire]]. He succeeded his older brother [[Jovan Dragaš]], who had been an Ottoman vassal since the [[Battle of Maritsa]] (1371) which had devastated part of the Serbian nobility. The brothers had their own government and minted coins according to the [[Nemanjić dynasty|Nemanjić]] style. His daughter [[Helena Dragaš|Jelena]] married Byzantine Emperor [[Manuel II Palaiologos]] in 1392. He fell at the [[Battle of Rovine]] (17 May 1395), serving the Ottomans against Wallachia, fighting alongside Serbian magnates [[Stefan Lazarević]] and [[Marko Mrnjavčević]].
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Constantine's grandson, last Byzantine Emperor [[Constantine XI]], was named after him, and even used the name ''Dragaš''.
