Meilum is a fighter in the Firewine Bridge area (4850, 700) that claims to be famous for being "the Sword Coast's most skilled swordsman." Insult him if you wish to contest his claim and win Gauntlets of Weapon Expertise and a Long Sword +1, among other loot.

Are you insulting me?! You had better not dare to insult me, or I'll show you the metal of my blade. Once I've drawn my sword, I'm honor bound to wet the blade.
Now you've done it. You'll be sorry for doubting my skill. So very sorry...