Jace was born at Silmot's Crossing on the plane of Vryn. His unique gift of telepathy manifested very early in his life, often to his parent's immense embarrassment. Desperate to curb the young man's precocious nature, his father sought the assistance of the local mage known as Alhammarret. Alhammarret took Jace from his father, and allowed him to apprentice underneath him. Under his tutelage, Jace spent years learning new spells and talents, but most importantly, he began to feel welcome for the first time in memory.

It was not to last though. Jace eventually became strong enough to try his talents against his master, and learned the shocking truth of his own existence. He discovered that his spark had ignited over a year ago, dipping him into the Blind Eternities only for a moment. Alhammarret had lied to him about what had happened, telling him his illusions had backfired and not to concern himself with it. Alhammeret confided in Jace's father about the event, and they agreed to keep the truth from Jace.

Jace seethed over this news for days, holding his temper close to his heart until finally, during one of their practice sessions, Jace snapped. Jace slipped into his mind and unleashed all of his rage and pain at once, completely destroying Alhammarret's mind. Jace fled, a wanted individual everywhere within a hundred miles of his hometown. Finally, Jace erased his own memories, so that he would never have to see his teacher's face again and feel the weight of what he had done.

Alhammarret was revealed to be a sphinx who arbitrated between the two warring factions of Vryn.[3] After a couple years of training, Alhammarret started sending Jace out to gather information. Under cover of darkness and cloaked by illusions, Jace would sneak into a camp of one of the opposing sides to learn about the army’s battle plans. During one of his reporting session Jace tried to enter his master's mind, a feat he had never accomplished before. He learned the shocking truth of his own existence. He discovered that his spark had ignited a long time ago, dipping him into the Blind Eternities only for a moment. Alhammarret had lied to him about what had happened and had repeatedly wiped the incident from the young man’s mind.[2] When Jace finally found out, he began to erase his own knowledge to keep it away from the sphinx. Instead, he kept records on paper.

Later it turned out that Alhammarret was playing both warring factions against each other by providing them with military intel, and thus keeping his status as arbiter intact. He used Jace as a go-between, to gather information from the Ampryn and the Trovians, deliver it, and learn more just in the delivery. And every time, he’d wiped Jace’s memory of it, taken the money for himself, and kept the war going.

Eventually, Jace goaded his master into a duel of telepathy. At the cost of much of his mind (and, inadvertently, his memories), he destroyed the Sphinx's mind, rendering Alhammarret unable to breathe.[2] The force of the battle, in combination with the damage done to himself, forced Jace to accidentally planeswalk away, landing himself in the streets of Ravnica.

-Wiki

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