In 1355 the monks of the Hilandar Monastery came to the Serbian Emperor Stefan Uroš IV Dušan and complained about border violations caused by the guards of the emperor in the villages belonging to the land Karьba. Stefan Uroš IV Dušan sent therefore the Serbian kefalija from Štip named David Mihojević to delimit the boundaries of the monastery property in this area. In the course of the border inspection, the Kozijačka Reka is mentioned, which flows into the river Brěgalnica (kako upada Kozijačtica u Brěgalnicu i posredь reke Kozijačke). In 1388/89 (?) The Serbian Despot Konstantinos Dragases (Konstantin Dragaš) confirmed the donation of the Serbian Vojvoda Dmitrь to the Hilandar Monastery. Kozijačka reka is attested in the boundary description of this metochion (prěšьd Kozijašnicu).