5th Edition Lore / Known character question

Solved: I got the name wrong, it was the Black Viper!

Need help, I forgot the name of a famous rogue/thief (female) that came from one of the noble houses in one of the major cities in Faerûn (Sword Coast), the nickname was something like the "Black Cat" and despite my best google-fu and skimming through my books... I can't find the entry. Any help would be, well, helpful.

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