Attack on Titan 86
So some mystical awakening or deal gave them Titan powers and basically after ruling the world they lost to the former empires resistance that stole their powers which lead them to be basically slaves in ghettos having tags like the Jewish People before WW2 in Germany.
The Titan King fled of these now enslaved people fled to a island near the continent and set up the Walled Kingdom we know in AoT today.
Also what happened to his sister got me... fucking scumbags.
Anyway King Fritz the King of the Titan people who ran away to that Island to set of a enclosed Kingdom had the Titan power to control other Titans as we all know but before he ran away to form a small new Kingdom he inherited the throne but neglected the Titan civil war that was going on due to his lack of resolve to fight. Thus the Mare or current ruling Kingdom used such passiveness to their own gain.
Weird that technology eventually fully adapted to the point there were warships and biplanes. Because of it, conveniently the Titan people that wanted to regain the power of the Progenitor Titan, the Alodians and the ruling Meer Kingdom had the same interest. Still dude having another son is interesting and what is even more interesting is his son (who he placed in Meer training in order to kill two birds with one stone) told the Meer kingdom of the Alodian uprising. Which leads us to wondering if the Titans attacking the Walled Kingdom right now are Alodians who have ulterior motives in order to defeat their masters the Meers or is it just the Meers.
Also this, http://i.imgur.com/6XkWGep.png