In the aristocratic pecking order, he's directly below a prince
He is usually treated in historic and encyclopedic works under his 
Austrian ... For the francophile, often francophone Russian aristocracy, the 
equivalence of... [DOC] [TLE] The Middletons deserve a title - step forward, the Earl and Countess ... [PAR] Jul 26, 2013 ... Their grandson - Prince George of Cambridge - is a future king.