Around 2,000 years ago, Ymir's village was attacked and enslaved by the Eldians, who also murdered her parents and cut out the tongues of the survivors.
One night a pig escaped from its pen and Ymir was blamed for it. As punishment, Fritz the tribe's leader released her into the wild in order for his men to hunt her for sport.
Wounded and desperate, Ymir found an unusually large tree with a chasm at its base. Seeking shelter, she stepped inside and, not knowing of the sinkhole beneath, fell down into a pool of water. There, a mysterious spine-like creature fused with her and turned her into the first Titan.
With her newfound power, Ymir returned to serve Fritz and used her Titan to cultivate the land, build bridges, and amass wealth for the Eldians. Under his command, she also vanquished the armies of Eldia's rival, Marley. To "reward" Ymir for her service, Fritz took her as his concubine and together, they had three children: Maria, Rose, and Sina
