March of Istria

The Istrian march (Mark Istrien) of the Holy Roman Empire about 1000 AD, alongside the marches of Verona and Carniola (Krain), Croatia and the Republic of Venice

The March of Istria (or Margraviate of Istria /ˈɪstriə/) was originally a Carolingian frontier march covering the Istrian peninsula and surrounding territory conquered by Charlemagne's son Pepin of Italy in 789. After 1364, it was the Istrian province of the Habsburg monarchy, the Austrian Empire and Austria-Hungary.