Christian Johann Heinrich Heine (ˈhaɪnʁɪç ˈhaɪnə; born Harry Heine; 13 December 1797 – 17 February 1856) was a German poet, writer and literary critic. He is best known outside Germany for his early lyric poetry, which was set to music in the form of Lieder (art songs) by composers such as Robert Schumann and Franz Schubert. Heine's later verse and prose are distinguished by their satirical wit and irony. He is considered a member of the Young Germany movement. His radical political views led to many of his works being banned by German authorities—which, however, only added to his fame. He spent the last 25 years of his life as an expatriate in Paris. Heine was born on 13 December 1797, in Düsseldorf, in what was then the Duchy of Berg, into a Jewish family. He was called "Harry" in childhood but became known as "Heinrich" after his conversion to Lutheranism in 1825. Heine's father, Samson Heine (1764–1828), was a textile merchant. His mother Peira (known as "Betty"), née van Geldern (1771–1859), was the daughter of a physician. Heinrich was the eldest of four children. He had a sister, Charlotte (later Charlotte Embden), and two brothers, Gustav (later Baron Heine-Geldern and publisher of the Viennese newspaper Fremden-Blatt), and Maximilian, who became a physician in Saint Petersburg. Heine was also a third cousin once removed of philosopher and economist Karl Marx, also born to a German Jewish family in the Rhineland, with whom he became a frequent correspondent in later life. Düsseldorf at the time was a town with a population of around 16,000. The French Revolution and subsequent Revolutionary and Napoleonic Wars involving Germany complicated Düsseldorf's political history during Heine's childhood. It had been the capital of the Duchy of Jülich-Berg, but was under French occupation at the time of his birth. It then passed to the Elector of Bavaria before being ceded to Napoleon in 1806, who turned it into the capital of the Grand Duchy of Berg, one of three French states he established in Germany.