Lia de Beaumont
Lia de Beaumont
Name in Japanese リア·ド·ボーモン
Rōmaji Translation Ria do Bōmon
Appears in Anime
Voice Actor (Japanese) Risa Mizuno
Voice Actor (English) Taylor Hannah
Personal Info
Gender Female
Relatives King Louis XIV (father)
D'Eon de Beaumont (younger brother)
Maximilien Robespierre (paternal half-brother)
Affiliation/s King's Secret
Status Deceased

Lia de Beaumont (リア·ド·ボーモン Ria do Bōmon?) was D'Eon's older sister, who was killed under mysterious circumstances. Despite flashbacks of her being a caring and considerate young woman, who was well loved by the nobles and the royals, the spirit that possesses D'Eon is full of great anger, sorrow, and the desire to exact revenge.

When she was alive, she and Maximilien Robespierre were lovers and he asked Lia to marry him, which she happily accepted. But when she read the royal Psalms, she discovers that Maximilien is her half brother from her and D'eon's father's affair with another woman and it devastated her and Maximilien and had to call off their engagement as their union might be considered incest.

"Lia de Beaumont" is the identity that the real-life cross-dressing Chevalier d'Eon claims to have assumed during a mission to Russia in 1756.[1][2]


  1. Le Chevalier d'Eon by Michel de Decker, published by France-Empire
  2. Monsieur D'Eon Is a Woman: A Tale of Political Intrigue and Sexual Masquerade by Gary Kates, published by Basic Books