If there are any parallels, I would look more closely at Song of Fire and Ice - the series. Or GoT. There are some much stronger similarities there than LotR. The manipulations and treachery over the throne. I'd compare Bryce to Ned Stark. Fergus could have been Rob...
We've got competing for the throne though not through various houses, however we have houses represented throughout Ferelden that show up at the landsmeet. They're just not all in a battle for rulership.
Alistair = Jon
Both bastards with noble fathers who were good men, the wall is a lot like the wardens. The wall keeps out wildlings while wardens watch over darkspawn threat. Both are are a major danger to their respective realms. Also, the wall seems to monitor white walkers to a degree though the wildlings appear to be their main concern while the white walkers are much closer to darkspawn it seems.
Jon was a virgin when we met him. So was alistair. Jon was sent to the wall because Catelyn Stark HATED him for what he represented. Alistair was sent to the chantry because Isolde hated him for what he represented. Difference is Jon thought it was going to be so much better than it was. But that would parallel with what Alistair thought of the Wardens and learned otherwise but is in denial of that truth - he only admits it in the fade.
Darkspawn return every few hundred years... like white walkers though time frames might differ. I'm not sure how long between white walker returns.
GOT/ Song of Fire and Ice was probably an inspiration to some degree for elements from both skyrim and DAO. DAO darkspawn to me are the parallel of what white walkers are. Skyrim makes the Draugrs - deathlords look a lot like them with the glowing eyes.
And of course... there are dragons...