>better historians

Of course, I'm so dim, I missed the hint in the word "regal". I suddenly thought in the middle of the night what about: http://wordsmith.org/board/showthreaded.pl?Cat=&Board=miscellany&Number=5634, not to mention a few Egyptian pharaohs. In fact, they never would have been a Louis XVIII if there hadn't been a few before him http://ftp.cac.psu.edu/~saw/royal/x10.html#LL

Even so, I still don't recall the word "junior" appearing, unless Prince Hal was known to his family as Henry Jnr.