In your essay on Dorne, you suggest that Vorian Dayne came after Davos Dayne. Which is a big surprise 1- Vorian would be far more plausible as the king who was eventually defeated and sent to the Wall, with Davos succeeding him as leader of the Dayne household. 2-If Vorian was sent to the Wall for leading a failed rebellion after the consolidation of the Martell as rulers of Dorne, it seems to me very unlikely that he would be sent with the status of king

Here’s my logic:

We know that during Nymeria’s first marriage, the Daynes were allies of Mors Martell during his nine-year campaign against the Yronwoods. Sending Vorian Dayne to the Wall in this early phase wouldn’t make much sense.
After Mors Martell’s death, which came before Nymeria’s eventual victory against the Yronwoods, Nymeria married twice, first to the Ullers and second to Ser Davos Dayne, who was the Sword of the Morning but not Lord of Starfall.
Davos Dayne’s son with Nymeria was passed over as Nymeria’s heir – which would break the First Men and Andal rules of succession that the Daynes would have followed – in favor of her oldest daughter with Mors Martell, following the new Rhoynar customs. In dynastic politics terms, this is a huge blow to House Dayne, rendering the marriage alliance useless.
Vorian Dayne, who was Lord of Starfall but not Sword of the Morning, was sent to the Wall at some point by Nymeria – why would the two come to conflict when their Houses had been allies in the war against the Yronwoods? Well, Nymeria’s decision to name her oldest daughter over her oldest son would be a clear casus belli.

My belief is that King Vorian Dayne was the older brother of Ser Davos, in one of those periods in which Dawn had been given to a non-ruler of Starfall (as was the case with Ser Arthur Dayne), that he allied with Nymeria against the Yronwoods, confirmed that alliance by marrying his highly symbolic younger brother to Nymeria, rebelled when his nephew was disinherited, was defeated, and was sent to the Wall as a King in part to smooth over ongoing tensions within the court at Starfall, as I can’t imagine it would have been easy for Ser Davos or his son during the rebellion.

The problem with your scenario is that, if Davos had succeeded Vorian, he would have been Lord Davos Dayne rather than Ser Davos Dayne when he married Nymeria.

Politics of the Seven Kingdoms: Dorne (Part II)

credit to Sir Other-in-Law If in Part I, there was a crippling lack of information about the history of Dorne, with the arrival of Nymeria and the Rhoynar we go from drought to flood. While I would argue that the full story of Nymeria’s odyssey to Dorne is one of the best additions to WOIAF, providing a great and sweeping drama of storms, pirates, haunted lost cities, plagues, and finally a safe…

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How do you envision some of the houses early on came to side with Nymeria/Mors? Maybe some were in the same position that Argilac was in but instead of fighting they allied to the cause to make sure their houses kept their lands as under Nymeria no one would stand in their daughters way to inherit. Surely they cant all have been beat into submission. Mybe some on the water ways also came for the technology and knowledge to make their lands more productive especially given the ”water witches”

Well, we can already make some educated guesses from the text. To begin with:

“the Rhoynar brought considerable wealth with them; their artisans, metalworkers, and stonemasons brought skills far in advance of those achieved by their Westerosi counterparts, and their armorers were soon producing swords and spears and suits of scale and plate no Westerosi smith could hope to match. Even more crucially, it is said the Rhoynish water witches knew secret spells that made dry streams flow again and deserts bloom.”

That’s a very attractive package for a Dornish lord or King, so I can see a good number of them signing up for material gain.

Equally important, the gender balance of the Rhoynish invasion/migration helped to encourage houses to join them – with eight out of ten Rhoynish being women, Nymeria’s policy of mass marriage incorporated hundreds of Dornish houses into the Rhoynar or vice versa, depending on how you look at it, with no one losing anything and the local Dornish getting wealthy brides.

Moreover, from the text we can see some geographical splits between the Dornish houses. The Yronwoods, who were ruling half of Dorne, viewed the Rhoynar as a threat to their predominance, and were joined by their bannermen, the Jordaynes, Qorgyles, Blackmonts, and Wyls.

If you look at a map, this coalition is concentrated in Northern/Western Dorne, but in the eastern and more northerly part of that region. By contrast, the Fowlers, Tolands, Daynes, and Ullers (who allied with Nymeria and the Martells) are mostly regional rivals who occupied the western and southern sections of the same region – these lords likely joined due to pre-existing tensions with the Yronwoods.

Further evidence of this self-interest comes from the fact that, of the six kings who Nymeria sent to the wall, two of them – Vorian of House Dayne and Garrison of House Fowler – were former allies. When you consider that Benedict of House Blackmont and Albin of House Manwoody were also mountain kings who “claimed dominion over the Red Mountains,” one definitely gets the sense that the Martells’ control over the western borders of their kingdom was shaky at best for some time.