I have been doing some research on Dol Armoth, Prince Imrahil and his children and while I have yet to find anything in the text if you google "Prince Imrahil" many sites will come up saying that Lothloriel was his daughter by birth, though I am not 100% on order of birth it was Elphir the Oldest, who is named heir and then I believe Lothloriel and Erchirion & Amrothos, and it does say in the text that King Eomer marries Prince Imrahils *daughter* It does not make any mention of her being adopted and even were he to adopt her I doubt she would be given the title of "Princess" I have been extensively researching Dol Armoth and reading all that I can though some of the stuff about the culture and customs I work to fill in the blank spots the best I can. Though personally I would not cite fanfiction as a source of information regarding her birth. Fanfiction is wonderful in that you can write anything you like, create any scenerio you please but wether it adheres to "canon" and bookverse is a completely different manner entirely.
This is the site where I obtained most of my information on Dol Armoth, Perhaps you might find it useful :)
Author's Response: I've been there, I love that website! It's so helpful, isn't it?rnrnThe fanfiction wasn't my information source, it was my idea source. In the books it ONLY says that Lothiriel was born on this day, she is the daughter of Imrahil, and the wife of Eomer and mother of Elfwine. And it says when they got married... I don't remember the date! Ahhhh! Anyways, but because of this, since it doesnt say she was NOT adopted and medieval (sp?) customs dictate that an adopted child who is elevated to peerage does indeed assume the title they would've obtained had they been biologically related to their birth parents, it still is possible- though highly unlikely that Tolkien even thought it out this far- that Lothiriel is adopted. And this whole situation is resolved later in the story, I promise you.
At just a few sentances in I am already confused, Lothloriel was a Princess of Dol Armoth and later became a Queen of Rohan, yes, but she *was* born a princess as she was the second child of Prince Imrahil and nowhere is it written that she fought in the War of the Ring, in all truth she was proably sent away from Dol Armoth to somewhere safer until danger passed, Is this story AU?
Author's Response: It actually does not say in the text that she was born a princess. It only says she was Princess of Dol Amroth. I've read several fanfics where Lothiriel was adopted, and even one where she was a woman from our world who was then adopted by Imrahil. This story is not AU because, as everything is pulled together, it all fits inside the confines of everything that Tolkien wrote.