Mononymous person town of Stendal, birthplace of the German art historian Johann Joachim Winckelmann, whom Stendhal admired. In the 20th century, a fourth French writer, Sidonie-Gabrielle Colette (author of "Gigi", 1945), used her actual surname as her mononym pen name, Colette. Some French actors and singers have used their given name or surname as a stage mononym. In the 17th and 18th centuries, most Italian castrato singers used mononyms as stage names (e.g. Caffarelli, Farinelli). The German writer, mining engineer and philosopher, Georg Friedrich Philipp Freiherr von Hardenberg (1772–1801), became famous as Novalis. The 19th-century Dutch writer Eduard Douwes Dekker (1820–87), better
Gabrielle Donnay She worked on tourmaline and was especially interested in the relationship between the physical properties of a mineral and its structure. She published more than 134 papers in her lifetime, almost half of which were collaborative projects with her husband. Donnay showed great insight into the various chemical mechanisms that were important in the growth of crystals." She died on 4 April 1987. Gabrielle Donnay Gabrielle Donnay, née Hamburger (21 March 1920 – 4 April 1987), was a German-born American crystallographer and historian of science. Gabrielle Donnay was born in Landeshut, Germany (now Kamienna Góra, Poland) on 21 June 1920