Looking over Wikipedia's article on adoption in Ancient Rome, I notice that it mentions that adoption of females "was much less common" than adoption of males. I don't see any sources for that ...
Both fiction and (contemporary at the time) conspiracy theories have many examples of "The king chooses to place a worthy replacement on the throne instead of his own not-qualified-to-rule offspring; ...
Primogeniture: The legal custom for the firstborn and only the firstborn to inherit the bulk of the estate, especially indivisible property. Bastard: An illegitimate child without the right to ...