Ra's al Ghul

Ra's al Ghul (real name unknown)is one of the two main antagonists of the Batman comics, alongside the Joker. He first appeared in Batman #232's "Daughter of the Demon". Ra's is one of Bruce Wayne's greatest enemies, the father of Talia al Ghul and Nyssa Raatko and the maternal grandfather of Robin (Damian Wayne).

His Nolanverse incarnation was portrayed by Liam Neeson and his DCAMU incarnation was voiced by Giancarlo Esposito

History
Ra's Al Ghul became the leader of the League of Assassins and fathered three children, which included the two daughters Nyssa and Talia. Ra's became Batman's (Bruce Wayne's) enemy when it appeared that Talia and Robin (Dick Grayson) were abducted to test and see if Batman was a worthy successor. However, Bruce refused and They have been enemies ever since. His daughter, Talia later had a coke with Batman, Damian, who eventually sided with his biological father and became Robin.