User blog comment:BlackWizardZeref/Fairy Tail: Chapter 436 Memoirs Review with a brief mentioning of Chapter 435 Victory Shout!/@comment-209.112.215.51-20150519051834/@comment-24039250-20150519075807

Mard Geer created Tartarus, but END was always intended to be the leader since he is the strongest of the Demons.