Empress Lenore is the former ruler of The Jennerit Imperium until Lothar Rendain staged a coup against her in an effort to save his people by allying with the Varelsi. No other information is currently available about her.
From the report of a lore challenge of Marquis:
"13:44:53 - [MONITORING] MAG-NET.JENNAR.BATTLE - Status of the battle between Rendain and the forces of Empress Lenore
Update: Empress's Imperial cruiser overtaken by Rendain's forces. Rendain has boarded the cruiser.
Exprected Outcome: Battle ended in favor of Rendain."