March of Istria
The March of Istria, or the Margraviate of Istria (German: Markgrafschaft Istrien) was a historical frontier county, or march centered on the Istrian peninsula. It was established after the Carolingian conquest at the end of the 8th century, and continued to exist in various territorial scopes and administrative forms within the Holy Roman Empire, consequently becoming integrated into the Austrian Kingdom of Illyria, and the Austrian Littoral.