Beatrice was born to Andrew Prior and Natalie Prior, after their only son, Caleb Prior. Beatrice's family was originally in Abnegation, the faction that cultivates the virtue of selflessness in the future city of Chicago. As part of Abnegation, Beatrice had always known the life she would follow—one free of vanity and focused on serving others and helping the Faction less. Despite this,she never fully learned to willingly follow their faction's virtues.
She was often overshadowed by her brother's apparent selflessness and often found herself thinking about her wants. She was often scolded by her brother for selfishness. She loved the idea of selflessness, but could not act it out. All of this, to be explained later, was due to the rare trait that Abnegation were mostly born with Being Divergent, Tris is not by nature limited to exhibit only one of the five traits. Since an early age, Tris was shown to have acted with a blend of curiosity and selfishness, traits that obviously does not make sense as an Abnegation. Her Divergence allows her brain to act with traits from three of the five factions, authentically proven through her Aptitude Tests when it showed her being equally apt for Abnegation, Dauntless and Erudite. Her most distinguished trait appears to be bravery. Tris is extremely brave, from being the first jumper to ranking first in the initiation. Though she doesn't seem like it, Tris' bravery outranks even some of the Dauntless members as observed through her actions. She courageously climbed the Ferris wheel during the first stage of initiation when even Four, the man having the least of fears reconsidered joining her. She waded through crowds of Dauntless-controlled soldiers and initiated an attempt to try stop the simulations. Her extreme bravery often leads people to think of her as someone who recklessly throw herself into danger. Four notes that Tris was becoming more of a reckless Dauntless, risking her life for situations that she cannot control when her bravery is at its height. More than once, she had also told herself that she would rather be dead than Faction less