After the death of the Marquise in childbirth in September 1749, Voltaire briefly returned to Paris and in mid-1750 moved to Prussia at the invitation of Frederick the Great. The Prussian king (with the permission of Louis XV) made him a chamberlain in his household, appointed him to the Order of Merit, and gave him a salary of 20,000 French livres a year. He had rooms at Sanssouci and Charlottenburg Palace. Life went well for Voltaire at first, and in 1751 he completed "Micromégas", a piece of science fiction involving ambassadors from another planet witnessing the follies of humankind. However, his relationship with Frederick began to deteriorate after he was accused of theft and forgery by a Jewish financier, Abraham Hirschel, who had invested in Saxon government bonds on behalf of Voltaire at a time when Frederick was involved in sensitive diplomatic negotiations with Saxony.