Bane's origin story is established in the story "Vengeance of Bane".
He was born in the fictional Caribbean Republic of Santa Prisca,in a prison called Pena Dura.
His father, Edmund Dorrance (better known as King Snake), had been a revolutionary who had escaped Santa Prisca's court system.
The corrupt government, however, decreed that his young son would serve out the man's life sentence,
and thus Bane's childhood and early adult life were spent in the amoral penitentiary environment.