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
Sidonie Matsner Gruenberg Sidonie Matsner Gruenberg Sidonie Matsner Gruenberg (1881–1974) was a parenting expert, writer, and director of the Child Study Association of America. In her 1912 book "Your Child Today and Tomorrow", Gruenberg popularized the idea of giving an allowance to children so they could understand how to spend it. Sidonie Gruenberg was born in Austria and educated in Germany and New York City. She married Benjamin Gruenberg, a biology teacher, in 1903, and had four children between 1907-1915: Herbert, Richard, Hilda, and Ernest. In her parenting books, she said that children do not have any moral actions, so parents should permit