Amour-Auguste-Louis-Joseph Berthelot, better known as baron de Baye (1853-1931), was a member of Société de Géographie, the world's oldest geographical society based in Paris. In the late 19th century, he made unique photographs of Ukrainians as he travelled across the country for an archeological expedition. Baron de Baye left behind a series of works on Ukraine, including Etudes sur l'archéologie de l'Ukraine antérieure à notre ère (1895), Kiev, la mère des villes russes (1896), En Petite-Russie: souvenirs d'une mission (1903), En Crimée (1908) and more. All of his works were published in Paris.