Historia Reiss, later known as Krista Lenz, emerges as the illegitimate child of Rod Reiss—scion of the royal family—and Alma, a servant. Her childhood unfolded in isolation on a Reiss estate, shadowed by neglect and Alma’s overt resentment, which manifested in avoidance and vocal regret over Historia’s existence. Fleeting solace arrived through clandestine visits from her half-sister Frieda Reiss, who taught her literacy and compassion. Each encounter’s memories were systematically erased by Frieda using the Founding Titan’s power, severing Historia’s awareness of her lineage. Following Wall Maria’s collapse, Rod forcibly reinvented her as Krista Lenz to obscure her royal ties, enrolling her in the 104th Cadet Corps. Alma’s death during a clash between Rod and the Military Police Brigade—where Rod disowned both mother and child—cemented Historia’s false identity. As Krista, she cultivated a veneer of relentless altruism, masking a craving for validation and latent death wish. This duality fueled reckless acts, such as a perilous blizzard rescue of injured cadet Daz, thwarted by Ymir, a sharp-witted peer. Ymir became instrumental in Historia’s metamorphosis, confronting her self-destructive impulses and urging her to reclaim her true name. During training, Ymir exposed her knowledge of Historia’s past and manipulated cadet rankings to safeguard her. Graduating tenth, Historia enlisted in the Scout Regiment, clinging to the hollow "Krista" persona until Ymir’s departure with Reiner and Bertholdt triggered emotional withdrawal. She renounced Krista as a fraudulent construct, declaring her inner self vacant. Her transformation crystallized during the coup against the monarchy. Facing Rod’s scheme to transform her into a Titan and reclaim the Founding Titan, Historia rebelled, rejecting his dogma and delivering the fatal blow as he mutated into a grotesque Titan. This defiance, bolstered by allies like Eren Jaeger—who validated her authentic self—propelled her ascension as Queen of the Walls, displacing the puppet monarchy. Crowned ruler, Historia spearheaded orphanage foundations and resource redistribution from corrupt nobles, prioritizing marginalized communities. Her reign embodied a hard-won commitment to self-governance and empathy, transcending a legacy of abuse. Later years saw her pregnancy and diminished public presence, yet her core narrative remains rooted in self-determination, forged through defiance of manipulation and trauma.