The cataclysmic event known as the Destruction of Bront took place prior to the year 0 ABY. The Galactic Empire engaged in horrific acts on Bront, ultimately causing the planet's annihilation. Graf Yonna, along with his family, were inhabitants of Bront during this period, with Graf being the sole survivor of the planetary devastation. Subsequently, he became a member of the Alliance to Restore the Republic, serving as an operative under General Airen Cracken, though he was deeply scarred by the loss of his home.