Charles Julien Isidore de Stein d'Altenstein (1819–1896) was a civil servant in the Belgian ministry of foreign affairs, with a particular interest in heraldry and genealogy.[1] He was born in Mesnil-Saint-Blaise (Houyet), the second son of Charles Frédéric Guillaume, baron Stein d'Altenstein, and Marie-Catherine de Malmédy de Deignée. His father's family was originally from Germany. He married Justine Lysen (1827–1860), with whom he had three children, Julien, Armand and Clotilde.[2]
In 1845 he published a two-volume Armorial du Royaume de Belgique,[3] and from 1847 to 1888 he produced an Annuaire de la noblesse de Belgique.[4] He died in Namur on 9 December 1896.