ACH: Primogeniture Kingdom in Europe

Aside from the most loony Cathar wank possible - and a good dose of misinterpretation of Catharism to boot - an absolutely enatic kingdom is pretty much ASB. Even succession biased towards women is beyond the pale, unless you're going before the Indo-Europeans (and willing to accept the worst sort of Gimbutasian Pre-IE analyses).

If you want a kingdom where succession is indifferent to female rulership, that's much easier - a short string of competent female rulers will do it.
 
Is there an extra-European nation with enatic or semi-enatic succession that could have invaded some part of Europe and held it for a while? This would probably require a very, very early PoD, though, like before the rise of Mycenaean Greece at least
 
An enatic kingdom anywhere is going to require a near ASB level of divergence. Matriarchy systems probably never really existed. A cognatic system on the other hand... that's more than doable (and is currently the case in the UK today for however much that counts). I would go as far as to say that it's not entirely implausible for matrilineal descent and inheritance to catch on either. The Ghanans practiced it and had a pretty sensible reason for doing so- it's impossible that the king's sister won't be the mother of her own child, but entirely possible for the king to be cuckolded. So just have that idea catch on at some point. Or have Judaism be more successful and have it grow out of our tradition of Jewishness passing down from the mother.
 
It's not a primogeniture system by any means, but in Mary Hoffman's Stravaganza series (based on an alt-Italy during the Renaissance, with a few tweaks by a couple time-travelling London teens from the present) has Belezza (an alt-Venice) which has a tradition of electing female rulers - but only those who are born on the main island in the lagoon are eligible.
 
Have a large Kingdom run at the top near exclusively by women with only the occasional King.
Kingdom of Netherlands was ruled by female monarchs for 4 generations in row despite male-preffered primogeniture.

What about this-hereditary high priestess is ceremonial head of state. She is belived to be descendant of goddess and her bloodline in unbroken female line is sacred. Although it is tricky-preserving unbroken female-to-female line for generations is challenge. In the case of men it could be easy solved by polygamy.
 
Kingdom of Netherlands was ruled by female monarchs for 4 generations in row despite male-preffered primogeniture.

What about this-hereditary high priestess is ceremonial head of state. She is belived to be descendant of goddess and her bloodline in unbroken female line is sacred. Although it is tricky-preserving unbroken female-to-female line for generations is challenge. In the case of men it could be easy solved by polygamy.

Only three in row and only because Alexander III hadn't son nor other close male relatives alive and Wilhelmina and Juliana had only daughters.

It is very difficult to create totally equal succession system without very early POD. Probably we should with some way butterfly Indo-Europeans away and I doubt that even that is enough. In OTL Sweden was first nation which adopted totally absolute primogeniture and this happened on 1980 so it might be impossible get such succession much earlier.
 
Absolute primogeniture is hard to establish. Even states that allowed Queen Regnants, eg Navarre, still had eldest son succeed - male preference primogeniture.
That's the best I can see happen. Then you tweak it so that there are less sons who die a lot and daughters succeed.
 
Honestly, you need a series of very capable women ruling somewhere (perhaps in Britain? Less external danger), followed by what is a line that keeps giving birth to girls rather than boys. There is an advantage there to succession via matralenial marriage. Every generation, a different noble family can marry in, and lands get added to the crown.

It could be an effective way to accidentally strengthen the monarchy.

A PoD could be a marriage of a King to a Basque woman, ideally a Navarranese Princess, who proposes the solution when there are no sons, simply to change the law, or even convinces her husband to allow it, and marry their daughters off matralinearly.

Another way it could be used is that talented men could be married to daughters, given lands, and have those lands return to the crown.

The larger nobles would catch on of course, but lesser or middle-ranked nobles may still be game. A lifetime of royal power, and favours for the family, in exchange for an inheritance? Not a bad deal.

What could be an interesting side effect (if Maria Theresa is anything to go by), is a better run state, but also a more aggressive England. If the King-Consort leads the armies, and the Queen runs the state, it can run better, and the Queen has an incentive to over-compensate. Cue earlier diplomatic and military moves. (Perhaps an earlier conquest of Ireland? Or for the sake of proving she can, Iceland and others - I doubt France is as likely a goal for a female ruler - trying to bring France and Britain under her rule might be hard).

At the same time, if deployed well, other feudal states can be undercut - marrying the Duke of Burgundy for example? Suddenly England and Burgundy would be under the same Royal couple.
 
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