Ra's al Ghul's predecessor

Ra's al Ghul was the predecessor of the current Ra's al Ghul and former leader of the League of Assassins

Biography
Ra's al Ghul led the League of Assassins for an unknown period of time having either succeeded another Ra's al Ghul or having been the first Ra's al Ghul and founded the League himself. At some point in his life, he encountered the current Ra's al Ghul and requested him to be his successor, which he accepted.