King of Rogues

The King of Rogues was the leader of the Cutpurse Legion, a band of thieves and highwaymen active in Korstraad during the warring states period (or whatever it's called).
Despite the name, the "King" was actually a woman, who called herself a king in order to throw people off as to her identity. It clearly worked, as nobody rememebrs who she was, and those few historians who are aware of her exploits now remember the "King" as being male.
She is suspected to have been one of the bearers of the Colana Dialiah, stealing it from the vaults of one of the jealous husbands that executed Valmont, the previous bearer of the Colana. After acquiring it, she performed a number of other high-profile heists, eventually stealing the Sovereign Sword of Korstraad and the broken fragment of its hilt from the Winter Palace, a symbol which allowed her to draw hundreds of supporters to her banner.
This drew the ire of one of the warlords competing for the Korstraadi throne, who beseiged her headquarters and forced her and her allies to flee across the rooftops and sewers. While this lord at first believed he had defeated her, derisorily referring to the bandits as the "cutpuse legion". However, the "King" took this exonym as a badge of honour and returned stronger than ever, undertaking a campaign of revenge that embarrassed and eventually dethroned this lord and eventually becomming powerful enough that none of the warlords could ensure stable supply trains without paying her off.
She then turned her dagger to the barbarian tribes, and was very successful in raiding them, but soon after she was eaten by a very large ourogarai (aka "dragonbear"; a "bear that could eat dire bears"), possibly Mother Bear herself.
The amulet then passed into obscurity for about 550 years, until it was used in the Feywild by Rivona, the renegade whisper gnome who led the Blackwood Treants.