Both reasonable and ah so excitingly close to a person I was thinking of. I believe I might have taken a too big bite of a pie here (falsely and too vaguely formed riddle I fear), so I will clarify: an answer can be found by translating "affection" or "love" into sindarin. Yes, hidden king is correct first part. ;D
Ah, I chose the daughter, you were looking for spouse.
Well, it's been a while.
Took a break because I had reached my brain's riddle limit (I think).
Rampion thief's ransom
Thanks to the modern marvel of the Internet, I was able to find that rampion is a type of flowering plant, which is also called "rapunzel". In the fairy tale of Rapunzel, the father of the title character steals some from a magical garden for his pregnant wife to eat. (The roots of the plant are said to be extremely tasty...or her pregnancy was giving her strange cravings...you pick.) Then a witch catches him red-handed, and in return for letting him go, the father promises to give her his child when she is born.
The only rampion thief I could think of was this father; his ransom might be his daughter, the long-haired Rapunzel? I do not at the moment know how this would reduce to the final step and will continue to mull it over, but thought that the above might be useful to others, if indeed it is on the right track.
The Arkenstone, Burglar Bilbo is lowered Rapunzel like down from the fortifications of Thorin and Co and uses the Arkenstone to ransom for peace.
Okay I was already thinkin Lúthien had something to do with the answer if indeed this is what you meant. She and Huan used athelas (rampion) to save Beren. I can't puzzle out the rest though. I don't believe Lúthien stole the athelas, nor can I really figure if the Silmaril they took could really be considered a ransom.
Maybe this will help ya'll out though.
BTW; It is indeed good to see ya back on this thread Boraxxe.
I'm fairly sure Lúthien, as said before, is the correct answer, but after re-reading the story about Lúthien and Beren from Silmarillion, I'd like to tell my theory of the riddle.
Rampion thief = Rapunzel thief, as said before, could refer to Lúthien's father Thingol - because he enthralled the "rapunzel" of this story, "stoling" her from Beren.
Ransom = currency/item paid for the freeing of a hostage
What did Thingol want from Beren "for Lúthien's hand"? Silmaril. Could "ransom" mean something similar, in metaphorical way, to "dowry" in this riddle? I don't know, but such an idea sprung into my mind after reading all the comments. :D
EDIT: Now that I read this, it feels stupid, but I'll let it be here, just for my own embarrasment and joy, hahaa!
Cool! Well I have a go then but I need some time to percolate. New one coming soon! :D
Okay lessee if anyone remembers this one...
Vulpes's halfling musings
Not a 3 2 1
So, fox's thoughts about hobbits?
Okay, not a 3-2-1.
Bears' Guest Obtained
Seems easy to me,
but we shall see
If "Bear" is meant in the verb sense, then I'm stumped. :P
Ah, I see that I was remiss in my spelling of my clue. Bears should have been Bears' as in the guest of bears. My fault entirely.
as to the 3 word clue; think outside the box (or should I say the books?).
BTW obviously both guesses are incorrect but again the fault is mine, this time.