OVA
Description
Born in 777 UC as the sole daughter of Count Franz von Mariendorf, a benevolent Imperial noble, Hildegard lost her mother in childhood. Her father encouraged her unconventional interests in political science, military strategy, and history over traditional aristocratic pursuits, fostering early independence and analytical skill.

Following Kaiser Friedrich IV's death in 797 UC, Hildegard convinced her father to back Reinhard von Lohengramm over Duke Otto von Braunschweig. She arranged a meeting with Reinhard, securing his pledge to protect her family's finances in exchange for support. Impressed by her political acumen, Reinhard enlisted her help rallying reformist lower nobles. When civil war erupted, he appointed her personal secretary and advisor; she focused on consolidating his political authority on Odin and drafting social and administrative reforms.

After Reinhard's civil war victory, Hildegard spearheaded sweeping Imperial reforms: dismantling the feudal aristocracy, eliminating systemic corruption, and introducing unprecedented civil liberties. She advised Reinhard against invading the Free Planets Alliance, arguing the defeated aristocracy remained a sufficient unifying enemy. Reinhard rejected her counsel, though subsequent events partially validated her assessment of the aristocracy's lingering threat.

During Operation Ragnarök in 799 UC, Hildegard served as a staff officer aboard Reinhard's flagship *Brünhild*. When Reinhard positioned himself as bait at the Battle of Vermilion, she independently devised a contingency plan. Recognizing the strategic vulnerability, she persuaded admirals Mittermeyer and Reuenthal to besiege the Alliance capital Heinessen instead of reinforcing Reinhard. This action forced the Alliance's unconditional surrender, indirectly securing Reinhard's victory. Mittermeyer later acknowledged her contribution as "worth more than a fleet."

In August 800 UC, after an assassination attempt on Reinhard included accusations about his inaction during the Westerland atrocity, Hildegard consoled him. Reinhard subsequently proposed marriage, citing his rejection of the Goldenbaum dynasty's lecherous traditions. Hildegard initially declined, questioning if obligation motivated his proposal rather than affection and expressing uncertainty about her own feelings. Discovering her pregnancy during Oskar von Reuenthal's rebellion, she informed Reinhard upon his return from Heinessen. Accepting his renewed proposal, they married in early 801 UC.

Following Reinhard's death later that year, Hildegard became regent for their infant son, Alexander Siegfried. Reinhard's final counsel authorized her to prevent their son from ruling if unfit and to establish a constitutional framework for the throne if necessary. Historical records credit her with guiding the nascent Lohengramm Dynasty through its foundational period, though specific details of her regency remain scarce.