Roman Sionis (Earth-4678)

"My lawyer will have me out on bail before the sun's up. And you know what I'm going to do when I get out? I'm gonna dedicate every waking minute to tracking you down and taking you out!"

- Black Mask, to Batman

Roman Sionis inherited his parents' fortune following their suspicious deaths in a fire and then went on to bankrupt their company. Saved by a buy out from Bruce Wayne, Sionis came to resent and hate his rescuer. Fixated on the concept of masks, Sionis carved one from his father's black coffin and sought revenge, becoming the Black Mask. Sionis was a feared gang leader and one of the most powerful mob bosses in Gotham City, with a burning hatred of Batman.

Source

 * https://arkhamcity.fandom.com/wiki/Black_Mask