All demons were once originally humans, who become demonic when tortured in Hell until their humanity is burned away.
In the absence of Lucifer and Lilith being imprisoned deep within the Pit, Azazel took control of Hell.
The pictured below is held by some archaeologists to be one of the most important archaeological discoveries in this region of the world in the last 30 years, as the main tomb was found intact and untouched by thieves.
Incidentally, she would eventually get revenge after climbing out of the grave where she was buried in, and burning down the village.