evidence: In the Middle Ages, Vukovar was the seat of the great Vukovo County, which was first mentioned in 1220 as "Comitatus de Wolcou". On the right bank of the Vuka was the royal fortress castrum Walkow. A settlement developed in its suburb (suburbium), which was granted the privileges of a free royal city in 1231 by Duke Slavonia Koloman. Until the XIV century, the city was recorded in documents as Walco, Vlcou, Volkow, Walko, Wlkoy, and then the Hungarian variant of the city's name – Wolcowar (for the first time in 1323) was mentioned more and more often. Since 1691, the town has been developing on the right bank of the Vuka, initially under the name Vukovarski otok (Insula Vukovariensis); since then, the Hungarian name Vukovar has supplanted the medieval Croatian name of the city. [6] [7] [...] - ^ "Port of Vukovar, Vukovar" (PDF). Retrieved 30 November 2023. [...] - Tourist office Vukovar - Photo Gallery of Vukovar