Gabrielle Séguin was a New Tuscan citizen and an officer of the New Tuscany Navy.
Holding the rank of Captain around 1922 PD, she was the commanding officer of the light cruiser NTNS Camille. Her ship was sent to the Pequod System to show strength against the Royal Manticoran Navy; once there, she witnessed the destruction of the freighter Hélène Blondeau. (SI2)