Can you remove your vallaslin if you are a male Dalish elf and you are in high approval with Solas ? I would really like to remove my Lavellan's slave markings.
Additionally, I think this is what happened in Elvhenan:- Elvhenan in its heyday was perhaps an amalgamation of Tevinter and Orlais, except it is with Elves. You had hedonism, slavery, debauchery, all of that. The slave elves, those with Vallaslin, rebelled against their masters.
Most likely Fen'Harel would have encouraged them or help foster the dissent, which earned him his nickname as the Trickster God.
Since Abelas said that Tevinter were not responsible for the fall of Elvhenan and Arlathan, this implies that it was the elves themselves who were responsible in doing so.
My theory is that the elven slaves rebelled against their masters, with the encouragement of Fen'Harel, probably with the help of and the alliance of ancient Tevinter. Slaves cannot just rebel without support so they had to rely on someone. The help Tevinter provided, the magic they provided to the elven slaves might have caused the destruction and sinking of Arlathan.
However, I think the total destruction of Arlathan and Elvhenan was not what the elven slaves wanted or intended. They most likely just intended to overthrow their leaders and well, things went awry. This then caused them to point fingers at the shemlen they allied with and hate them for it. Hence, the "Tevinter caused the fall of ancient Elvhenan" myth. It is a half-truth, half-lie.
That is why they, the elves, lost their culture, their history, their magics and their history. Because the ones who instigated the fall were slaves and slaves are not very knowledgeable in history, culture, technology or magics.
This is also why we saw the ancient Tevinter actively collaborating with the Dwarves of Cadash Thaig to destroy the Elves who decided to seek refuge there. They were probably doing so because the Elves who fled were not the Elven slaves but remnants of the Elven upper class society.
This is also why Solas who we now know as Fen'Harel has something against the Dalish Elves. Perhaps they were intended to overthrow their rulers and take their places, not destroy Elvhenan. This is why he said something along the lines of Dalish having lost their way.
This would also explain why the Elven "gods" have not spoken to the Elves in ages even though they were around in different forms. Flemeth was for example the Herald of Mythal.
As such, what was left of the ancient Elves were the elven slaves, those who wore vallaslin, those who, for most of their lives, were enslaved and as such lacked the capability to rebuild Elvhenan anew. Even Fen'Harel mentions that the Dales were nothing but a shadow of cities like Arlathan. I mean, you cannot expect groups of slaves to know how to build nations, maintain governments and be masters of magics.
This "Vallaslin as a mark of the slave" also shows the parallel of the Dalish Elves with the Casteless of Orzammar. The difference is that the Dalish no longer have anyone to rule over them.
I honestly think that the upper class Elven societies of old had good ties with ancient Tevinter. Both were highly advanced magical societies and based on Solas' attitude towards Blood Magic and the possibility that old Archons were taught Blood Magic by ancient Elves, it is highly likely in their heyday, the upper class in both societies were good pals.
As for Tevinter enslaving the elves, slavery has been practiced by Tevinter for ages. After the fall of the Elvhenan, the freed elves just wandered around. Some would have been either captured as slaves by Tevinter and some would have even willingly joined them as indentured servants.
This is obviously my speculation. I would like to hear your' folks thoughts on this.