Like surrounding villages and towns, origin of Köseçobanlı residents are mostly Yörüks (nomadic Oghuz Turks) who had migrated from Turkestan during Mongol invasions.
Serres fell to the Ottoman Empire on 19 September 1383, and initially formed a fief of Evrenos Beg, who brought in Yörük settlers from Sarukhan.
Yoruk Ali continued the guerilla warfare against the Greek Army until his forces were enrolled within the ranks of the re-organized Turkish Army.