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He belonged to a well-known Belgian family, and his cousin, Edouard Pirmez, was distinguished for his works on literary and political subjects. He lived an uneventful life at his family's château at Acoz, in Gerpinnes in Hainaut, where he died.
Pirmez was an ardent admirer of the French Romanticists. His works include:
- Les Feuillees: pensées et maximes (1862)
- Victor Hugo (1863)
- Jours de solitude (1869)
- Souvenirs d'un frère (1880)
- Heures de philosophie (1881)
- (posthumous) Lettres à José (1884).
These books form a history of his emotional life, and reveal an extreme melancholy.