The Crown Season 1 - A History Question

[EllieQ]

I’ve started watching season 1 of The Crown, and I have a question about something Queen Mary (George VI’s mother and Queen Elizabeth’s grandmother) says in an early episode. She says that she’s seen the destruction of three royal families in her lifetime. I’m certain two of them are the Russian royal family (the revolution) and the German royal family (the Kaiser abdicating at the end of WW1), but who would be the third? Can anyone with a better knowledge of history help me out?

Would it be the Greek royal family? Not that they were Greek! Prince Philip’s immediate family.

Yes, that could be it! Had a quick look at their history on Wikipedia and the timeline would match her comment. Thank you