The Widow Harun
The Mulan are the predominant human ethnic group in the nations of Thay, Unther, and Mulhorand. Not native to Faerun, they were brought to Toril as slaves by Imaskari wizards operating an enormous dimensional portal.
The Mulan are described in much more detail in the Forgotten Realms core books and supplements. Please consult these if you wish to learn more.