Interlinguistics of interlinguistics are, however, not so constructive, but rather descriptive, comparative, historic, sociolinguistic, or concerned with translation by humans or machines. As for Esperanto, which is the most widely used constructed interlanguage, there is a relatively abundant literature about the language itself and its philology (see Esperantology). Only a few of the many constructed languages have been applied practically to any noteworthy extent. The most prosperous were Volapük (1879, Johann Martin Schleyer), Esperanto (1887 Ludwik Lejzer Zamenhof), Latino sine flexione (1903, Giuseppe Peano), Ido (1907, Louis Couturat), Occidental-Interlingue (1922, Edgar de Wahl) and Interlingua (1951, IALA and Alexander Gode), with
Ludwik Marteau Ludwik Marteau Ludwik Marteau, originally Louis-François Marteau (c.1715, Paris - 2 November 1804, Warsaw) was a French-born Polish court painter who served under kings Augustus III and Stanisław August Poniatowski. All of his known works are portraits; both full size and miniatures. His father was a carpenter at the royal Palace of Versailles. One of his aunts on his mother's side was married to the Polish court painter, Louis de Silvestre. It is not known exactly when he arrived in Poland, but it appears that his teacher, Maurice Quentin de La Tour made the recommendation to go and Silvestre arranged