Vrbas River photographed in Banja Luka, Republic of Srpska. Vrbas got its name from the word "vrba", which in Serbian language means "a willow tree". | Река Врбас фотографисана у Бања Луци, у Републици Српској. Врбас је добио име од речи "врба". | Photo: @vladandbg
The name "Banja Luka" was first mentioned in a document dated 6 February 1494, by Vladislav II. The name is interpreted as "Ban's meadow", from the words ban ("a medieval dignitary"), and luka ("a valley" or "a meadow"). The identity of the ban and the meadow in question remain uncertain, and popular etymology combines the modern words banja ("bath" or "spa"), or bajna ("marvelous") and luka ("port").