“It’s the “commoners” who look these things up.”
The “Royals” are obsessed with “royal blood.” That’s why so many of them have married their cousins and a hell of a lot of times their first cousins.
The serfs still worship these inbreds.
Royals became inbred marrying cousins and such—because they were (until the 20th Century) required to. They also normally didn’t associate with anyone but their “social equals”...not by choice...but again, as that was required of them, so the only people they knew were other nobility.
Ordinary people have wanted royals, as much or more...as royals wanted to stay royals... Otherwise the wildly popular fascination with royals—by “commoners,” wouldn’t exist.
In the UK too, it works quite well, as the Prime Minister can go on and do the business of State, without nearly the popular attention that any US President must endure—because the British (figure)head of State & family, with all their wealth and pomp, the royals, garner most of the attention.
No Prime Minister, for example, has ever gotten the Messiah-like worship from Media & Entertainment...as Mr. 0 did....and that works well for them.
The US on the other-hand, wraps our head of state and figurehead into one person, and that causes lots of problems—both in over-admiration by popular Media (Obama) and over-the-top criticism by popular Media(Trump), interfering with the ability to govern well.