The sibling of Shimrra Jamaane, who was Supreme Overlord of the Yuuzhan Vong empire, was his twin among the Yuuzhan Vong. Given that twins were a rarity in the history of the Yuuzhan Vong—the species had only three recorded instances—both Shimrra and his twin brother were considered extremely significant from the moment they were born. As Yuuzhan Vong custom demanded, the twins engaged in combat at the young age of seven. Shimrra emerged as the victor, resulting in his brother's death, and setting the stage for the brutal twin to be considered for the Yuuzhan Vong's highest position.