Yes, and that was mostly due to biological factors combined with societal needs and the general repression of all genders outside of places of power. E.g. why

Yes, and that was mostly due to biological factors combined with societal needs and the general repression of all genders outside of places of power. E.g. why were female knights not common? Because knights were given land and in return were expected to answer their lord's summons. A woman that is pregnant cannot answer the summons and must send a delegate to lead her men. I hope I don't need to explain to you the drama and turmoil a no-show like that might lead to, both in military and political terms. Instead, the wives were (usually) the second in commands, and lorded over the lands in the absence of their husbands.