User blog comment:Reilock/Season 4: History/Lore of the League: Thoughts/@comment-5514182-20131108040448/@comment-5035765-20131108054048

To add to this, whoever Aatrox sides with in wars tend to win (lore wise, at least), so by having him on their side, the League have a powerful ally in case any of the city-states decide to get uppity...