Claim: Franz Xaver Wolfgang Mozart, a composer, pianist, conductor, and teacher of the late classical period and son of Wolfgang Amadeus Mozart and Constanze Mozart, was born on July 26, 1791 and was also known as Wolfgang Amadeus Mozart, Jr.
Evidence: He was a composer, pianist, conductor, and teacher of the late classical period whose musical style was of an early Romanticism, heavily influenced by his father's mature style. Franz Xaver Wolfgang Mozart (26 July 1791 – 29 July 1844), also known as Wolfgang Amadeus Mozart, Jr., was the youngest child of six born to Wolfgang Amadeus Mozart and his wife Constanze.