Ra's al Ghul (Comics)

Ra's Al Ghul: A international terrorist who lived through nearly several centuries. Aided by his daughter Talia, Ra's Al Ghul plans to eradicate most of mankind in order to save it from global devastation. He is considered one of Batman's greatest foe and often wishes for The Dark Knight to taker over what he started.

History
"I am neither a zealot nor a madman. I am a realist at least, and a futurist at best. Some do not agree. Thus, we must use whatever means neccessary to protect and preserve what mankind would pillage and rape. The world will thank us someday."- Ra's Al Ghul

Ra's al Ghul is an international terrorist and assassin whose ultimate goal is a world in perfect environmental balance. He believes that the best method by which this can be achieved is to eliminate most of humanity. Ra's usually tries to assault the world's human populace with a biological weapon, such as a genetically-engineered virus. He is aided in this quest by the Lazarus Pits, reservoirs of rejuvenating chemicals that restore the dying to life; these pits have granted him a lifespan of several hundred years.

He considers Batman his worthiest opponent, and has frequently sought to make the Dark Knight his successor. He is one of the few criminals in Batman's rogues gallery to have deduced his secret identity as Bruce Wayne. Ra's usually refers to Batman as 'Detective', possibly in recognition of his formidable mental prowess, and the intellectual battles in which they engage, as opposed to Batman's traditional physical conflict. For his own part, Batman's opposition to Ra's is complicated by his love for the villain's daughter, Talia.

Ra's is often accompanied by a loyal manservant, Ubu.(From Batman Wiki)