Transylvanian Military Frontier
The Transylvanian Military Frontier (Romanian: Granița Militară Transilvăneană; German: Siebenbürgische Militärgrenze; Hungarian: Erdélyi határőrvidék) was a territory in the Habsburg monarchy. It was a section of the Habsburg Military Frontier.
Source: Wikipedia — Transylvanian Military Frontier (CC BY-SA 4.0)