Peter Petersen Backmann was born on 21st June, 1737. Johann Hoff was born on 21st June, 1771 in Westerburg. François-Napoléon Cellier was born on 21st June, 1805 in Saint-Nicolas d'Aliermont. Jules-Frédéric Huguenin was born on 21st June, 1814 in La Brévine. Pierre-Alexandre Laneuville was born on 21st June, 1816 in Saint-Nicolas d'Aliermont. Adolphe Hirsch was born on 21st June, 1830 in Halberstadt. Marie Cécile Huguenin was born on 21st June, 1843 in Les Ponts-de-Martel. Camille Huguenin was born on 21st June, 1861. Florine-Maria Denis was born on 21st June, 1862 in Saint-Nicolas d'Aliermont. Arsine-Aimée Auzout was born on 21st June, 1882 in Saint-Nicolas d'Aliermont.
Johannes Hochenadl died on 21st June, 1743. Jean-Guillaume Delépine died on 21st June, 1818 in Saint-Nicolas d'Aliermont. Ferdinand Melly died on 21st June, 1846. François Élisée Audemars died on 21st June, 1865 in Paris. Heinrich Abeler died on 21st June, 1948. Berthe-Camille Denis died on 21st June, 1951 in Issy-Les-Moulineaux, Hauts-de-Seine.