Honor Bound

Honor Bound - Duel Ser Landry

Walkthrough
Walking by Ser Landry in the Market District of Denerim automatically triggers this quest. He recognizes you from Ostagar and denounces you as a Grey Warden traitor.
 * 1) You can persuade / lie - that you aren't a Grey Warden - he apologizes and walks off.
 * 2) If you fail harder persuade / intimidate checks regarding Loghain's role in Ostagar (he's personal friends with Loghain) he insists on challenging you to a duel and demands you meet him in the back alley bar behind the Gnawed Noble Tavern. He then heads to the alley
 * 3) If you decline the duel - he walks away insisting "this isn't over" (Later, while traveling in Denerim you will have a random encounter where he and his seconds ambush you, forcing you to kill him.)

Result
if you follow him to the back alley you can either jump him - in which case his three knight "seconds" also attack, or accept his one-on-one duel. If you win:

''You killed Ser Landry in a duel. Perhaps in his final moments he reconsidered the worth and honor of the Grey Wardens. ''

He has a gold ring and a nice mace:
 * Engraved mace (Veridium), Damage 6.5, Critical Chance .65%, Armor penetration 5.8, Strength Modifier 1, +1 Dexterity, +1 damage, +5 mental resistance, one enchantment slot.