The Duke of Slavonia (Croatian: slavonski herceg; Latin: dux Slavoniae), also Duke of Dalmatia and Croatia (Croatian: herceg Hrvatske i Dalmacije; Latin: dux Dalmatiae et Croatiae)[1] and sometimes Duke of "Whole Slavonia", Dalmatia and Croatia (Croatian: herceg cijele Slavonije, Hrvatske i Dalmacije; Latin: dux totius Sclavoniae, Croatiae et Dalmatiae)[2] was a title of nobility granted several times in the 13th and 14th centuries, mainly to relatives of Hungarian monarchs or other noblemen.[3] The title of duke signified a more extensive power than that of the Ban of Slavonia or Ban of Croatia.[4]