It is not clear, if he is the same person as Vratko, a nobleman of the Serbian King Stefan Uroš IV Dušan, who held the position of župan in 1333 (župan Vratkō/çuppanus Vratcho). Vratko is mentioned in the archives of the city Dubrovnik under the date 7.1. 1333 (Et Vratico, qui fuit et est nobis favorabilispenes dominum regem, D. ducatos de auro; Et Vratico qui fuit et est nobis favorabilis penes dominum regem VIC ducatos de auro), 19. 3. 1336 (fuit sibi ablata una salma per Vraticum nomine domini regiss apud S. Sergium) and 11. 7. 1336 (conqueritur supra Vraticum baronem domini regis Raxie...valoris yp. 190 grossorum de cruçe). He is attested as knez also in two Ragusan charters concerning his belt, which was pawned in Dubrovnik and which he demanded back (pojasь kneza vratka; ōtь kneza Vratka). According to the later sources was knez Vratko the father of Princess Milica of Serbia and the father-in-law of her husband Serbian Despot Lazar Hrebeljanović. Konstantin Kostenečki and then several of the Serbian genealogies (rodoslov) reconstructed his ancestry back to Vukan Nemanjić. Mentioned for the year 1342 by the Byzantine historian Ioannes Kantakuzenos. He was a military commander of the Serbian auxiliary troops, 1342. He was one of the Serbian commanders, who were supporting the Byzantine Emperor Ioannes VI Kantakuzenos during the siege of Serres at the end of the summer 1342. He fell temporarily ill and the army had to remain in the military encampment for eleven days (ἐν ᾧ δὲ ταῦτα ἐτελεῖτο, Βράκτος τῶν ἡγεμόνων τῆς στρατιᾶς ὁ διαφορώτατος ἐνόσησε καὶ διεκαρτέρησεν ἐκεῖ ἡ στρατιὰ ἐστρατοπεδευμένη μίαν ἡμέραν ἐπὶ δέκα).