The British royals believe they are the Davidic dynasty.
They should disavow this claim just as Hirohito disavowed his claims to (chas veshalom!) "divinity."
They have *kind of* disavowed it. I believe that at one time official royal genealogies showed David and Biblical prophets in the line, but those references have been removed now.
And the royals seem to have made sure that it was publicized that Prince William and Price George were not circumcized, especially by a mohel! I believe Lionel Snowman, the son of the rabbi that did Charles, is still active as a mohel.
I’m not sure the Davidic descent story was believed from ancient times but rather is a creation of the ‘British Israel’ movement that was popular 100-150 years ago.
Someone pointed out that such claims may have fed Continental anti-Semites’ paranoia about ‘hidden Jews’ that ultimately resulted in WWII. That does seem plausible.
I’d guess the current royals are taught that it was just a myth.