Black Mask's
origin story was established in his first appearance. Roman Sionis was born into one of
Gotham Citys elite families, to
wealthy and utterly self-absorbed parents, caring more about their social status than their son; moments after his birth, the doctor carelessly dropped him on his head. Roman's parents were less concerned about their son's well-being and more concerned about covering up the entire incident out of fear of how their wealthy friends would react to the news of their son's injury. A second incident occurred when he was a child. While at the Sionis family country estate he was attacked by a
rabid raccoon. This incident was also covered up by the Sionis family, who forbid Roman to mention it to anyone.
Further adding to the cauldron was his father's "friendship" with
Thomas Wayne; both of Roman's parents disliked the Waynes and were quite vocal about it in private with their son. However, to their son's dismay, they continued to associate with Thomas and Martha Wayne and pretended to be friends with the couple, to the extent of literally forcing him to become friends with their son, Bruce. His parents'
hypocrisy had a deep impact on him, and he grew to hate and resent them and the "masks" they wore in public.