Hungarian-Merovingian Connection
There are connections between Hungary-Transylvania and the Merovingians. My hypothesis is that this is the same group changing its name with the death of various leaders and movement of their seats of power.
The tie to Bran was also cleverly hidden in a popular book and television series in a way that the “author” was completely unaware. It was one line from a character and is related to this–the small key to tie the Hungarian royalty specifically to the Merovingians.