TIL that even if King Charles III had an older sister, he still would have been first in line to the throne; male-preference primogeniture wasn't changed to absolute primogeniture until the 2011 Perth Agreement.

https://en.wikipedia.org/wiki/Perth_Agreement
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1g8kpy6/til_that_even_if_king_charles_iii_had_an_older/