Tomislavgrad, also known by its former name Duvno, is a town and the seat of the Municipality of Tomislavgrad in Canton 10 of the Federation of Bosnia and Herzegovina, an entity of Bosnia and Herzegovina. As of 2013, it has a population of 5,587 inhabitants. In the Roman times, it was known as Delminium. During the Middle Ages when it was part of Croatia and Bosnia, the town was known as Županjac. This name remained until 1928 when it was changed to Tomislavgrad.