The Apostate was a male Shedai.
Aeons ago, the Apostate allied himself with the Tkon Empire to eradicate the Serrataal, a group of Shedai known as The Enumerated Ones led by the Maker. He provided the Tkon with a weapon that could defeat the Shedai, but did not tell them how to activate it because they refused to show mercy to himself and his brethren. The Maker, and her faithful, then ambushed the Tkon's capital system and detonated its star which ended the Tkon threat. (VAN novella: The Stars Look Down)
He was awakened in 2266 by the Shedai Wanderer, but refused to join her in eradicating the Taurus Reach of Telinaruul. He saved the USS Sagittarius from destruction on Jinoteur IV by other Shedai, and made contact with Vanessa Theriault, the starship's science officer. He then scattered the Shedai across space and removed the Jinoteur system from space-time to a pocket universe to keep its technology from the other Shedai. (VAN novel: Reap the Whirlwind)
In 2268, he led Lieutenant commander Bridget McLellan and Cervantes Quinn, who were working for Starfleet Intelligence, to his pocket universe. He appeared to them as a giant angelic figure and showed them the activation device to the Tkon weapon so that they may defeat the Serrataal. He explained that he was unable to complete the task himself as he was dying, having used his strength to create the pocket universe.