Is Arch-baron a Thing?

The ruler of the Grand Barony of Orcspire has the unusual title of “Arch-baron.” It is said the original arch-baron took the title when he accepted the fealty of two client barons, but was afraid to claim a higher title lest he offend the counts and duke who neighbored his domain. To say the least the politics and rules that governed the Auctoran Antebellum period were a bit odd.