Generalfeldmarschall was a rank in the armies of several German states and the Holy Roman Empire, (Reichsgeneralfeldmarschall); in the Habsburg monarchy, the Austrian Empire and Austria-Hungary, the rank Feldmarschall was used. The rank was the equivalent to Großadmiral in the Kaiserliche Marine and Kriegsmarine, a five-star rank, comparable to OF-10 in today's NATO naval forces.