Grégoire (1823-1890) was another of Henner's older brothers.
Contrary to Séraphin, he lived in Paris and worked as head guard at the Louvre museum. Henner and his brother were also very close, seeing each other regularly and sending each other many letters.
Henner dedicated 16 portraits to him: this one was painted in 1889, a year before the model's death, and presented at the Paris Universal Exhibition that same year.