Maria Constanze Cäcilia Josepha Johanna Aloysia Mozart (née Weber; 5 January 1762 – 6 March 1842) was a trained Austrian singer. She was married twice, first to Wolfgang Amadeus Mozart; then to Georg Nikolaus von Nissen. She and Mozart had six children: Karl Thomas Mozart, Franz Xaver Wolfgang Mozart, and four others who died in infancy. She became Mozart's biographer jointly with her second husband.
