L. L. Zamenhof L. L. Zamenhof Ludwik Lejzer Zamenhof (; , ; – ), credited as L. L. Zamenhof and sometimes as the pseudonymous Dr. Esperanto, was a Polish-Jewish ophthalmologist and the creator of Esperanto, the most successful constructed language in the world. He grew up fascinated by the idea of a world without war and believed that this could happen with the help of a new international auxiliary language, which he first developed in 1873 while still in school. Zamenhof was born on 15 December (3 December OS) 1859, the son of Markus Zamenhof (27 January 1837 - 29 November 1907) and
Samuel Ludwik Zasadius Samuel Ludwik Zasadius Samuel Ludwik Zasadius or "Zasadyus", "Sassadius" (c. 1695–1756) was a Polish religious writer, pastor and author of popular sermons and prayer-books. He was also known for propagating Polishness in Cieszyn Silesia. Zasadius was born c. 1695 in Komorzno as the son of a Polish pastor. He studied in Wittenberg and Jena. In the years of 1721–1730 Zasadius was a deacon and preacher of Jesus Church in Cieszyn. He led educational activity, published Polish magazines and learned the Polish language. In 1730 he was expelled (with pastors Johann Adam Steinmetz and Jan Muthmann) from the Austrian monarchy for