Franz Xaver Niemetschek was born in 1766 in what is now the Czech Republic and came from a musical family, which gave him a deep appreciation and admiration for Mozart's genius. In 1798 he published his biography on Mozart, with a touching dedication to Haydn, the only one written by an eyewitness, and authorized by Mozart's widow Constanze. It is one of the earliest specimens of musical biography which, compared with other branches of biography, was still in its infancy even in the later part of the 19th century. In this sense, it is an important document of music history. However, this loving and intimate portrait of Mozart, based on documents, letters and other original sources, also conveys a vivid picture of the social and especially courtly life that formed the background of Mozart's sheer magical talents as composer and virtuoso.