The flag from the map of Angelino Dulcert
The flag of Neretva from the map of Angelino Dulcert is quartered blue and white, as described in "Libro del conoscimiento de los reinos" [1]. According to Aleksandar Solovjev, "Contributions to Bosnian and Illyrian heraldry" [2], at the time of writing of this book (about 1330), Neretva was the part of Bosnia (since 1324), whose coat of arms at that time was: azure a bend argent; that is its oldest known coat of arms, used by ban Stjepan Kotromanic' (died 1353) [3]. The flag attributed to Neretva thus might actually be the flag of Bosnia, having been derived from its coat of arms.

