Young Bruce Wayne is the only son of prominent Gotham City doctor Thomas Wayne and his wife Martha Wayne. Two events in his childhood forever scared the future of Bruce. The first was when he accidentally fell through a hole in the grounds of his ancestral home Wayne Manor and found himself in a cave system that ran under the house full of bats. For years afterwards Bruce would catch sight of one particularly large bat over and over again.
The second and most tragic event happened just after the family had left a showing of the classic film "The Mark of Zorro" at the cinema and was walking back to their home. They were confronted by a mugger who demanded that they handed over their valuables. Thomas Wayne put up a struggle and in the process he and his wife was shot dead. The mugger ran off leaving the shocked Bruce alone with the bodies of his dead parents. First on the scene was physician Leslie Thompkins who sought to look after Bruce.
Batman appeared in Gotham and had criminals running scared. After a few years, Batman met his match when he met Selena Kyle AKA Catwoman, though the two fought, they fell in love. Although he never knew it, Bruce had fathered Selena's daughter, Helena.
In one of the last nights that Batman would appear in Gotham, he had it out with The Joker and broke up his criminal ring. On that night, The Joker had Selena killed, and shot Barbara Gordon himself. This sent Batman over the edge and a few months later, he left Gotham.
No One currently knows where is.