Attack On Titan Curse Of Ymir : When she died exactly thirteen years after receiving her power, and so her nine deciphles (the nine titans of ymir, for example the colossus titan, armoured titan, beast titan and attack titan).

Right.titans are originally humans that have their great sins, soldiers from other side of the world injects humans that are cause of sins as you can see those who are side of ymir (from the other side) get to punished and became a titan.