Mozart's wife, Constanze Weber, was born in Zell im Wiesenthal. She was the third daughter of Fridolin and Caecilia Weber. Fridolin Weber was a singer, three of his four daughters sang and played the piano, and his brother's son was the great composer Carl Maria von Weber. When Mozart first met the Webers during his visit to Mannheim with his mother in 1777, Fridolin was a prompter and copyist for the court theater, although he had originally been a bass. His second daughter, Aloysia, 16, had a remarkable coloratura soprano voice and the 22-year-old Mozart fell in love with her. Constanze was then 15. The Electoral court moved to Munich, and on Mozart's return from Paris at the end of 1778 he found that Aloysia had been engaged as an opera singer and had not waited for him. He returned to Salzburg alone, but did not forget the family. Following Aloysia's career, the family moved to Vienna in 1779, but Fridolin Weber died suddenly not long after. Aloysia married, and her mother, who now had three unmarried daughters still at home, took in lodgers to supplement her income. When Mozart arrived in Vienna in 1781 and ended his service to the Salzburg Prince-Archbishop, he boarded for a time with the Weber family, and became involved with Constanze, now aged 19, to the dismay of his father in Salzburg who feared any distraction from Wolfgang's concentration on establishing his career. Constanze and Wolfgang were married in St Stephen's cathedral, Vienna, in 1782, and their first child, Raimund Leopold, was born the following year. Constanze and Wolfgang spent late July 1783 to end of October 1783 in Salzburg with Wolfgang's father Leopold and his still unmarried sister Nannerl, leaving their six-week-old baby with a nurse in Vienna. At the end of the Salzburg visit, Constanze sang one of the two soprano solo parts written for her in Mozart's C minor Mass K.427, performed in St Peter's abbey church. On returning to Vienna they discovered that the baby had died in August. The next child, Karl Thomas, born in 1784, survived to adulthood, but a boy in 1786, a girl in 1787 and another girl in 1789, died in infancy. The last child, Franz Xaver Wolfgang, was born four and-a-half months before his father's death. A widow at 29 with two young children and sizeable debts, Constanze petitioned the Emperor for a small pension, which was granted, and by shrewdly and energetically marketing Mozart's music and undertaking concert tours with her sister Aloysia, now separated from her husband, she managed to clear the debts in surprisingly few years. As the years passed she became a wealthy woman. Her sons were educated in boarding school in Prague. In 1809, aged 47, she married Georg Nikolaus Nissen, a Danish diplomat she had met in 1797 when he was her tenant, and they spent the years from 1810 until Nissen's retirement in 1820 in Copenhagen. After travelling in Germany and Italy they settled in Salzburg, where Nissen began writing a biography of Mozart, completed by Constanze after his death in 1826. Constanze continued her work of championing the music and memory of Mozart. She also interested herself in her sister-in-law Nannerl, now the widowed Baroness von Berchtold zu Sonnenburg, then in the blindness and infirmity of her declining years. Constanze was joined in Salzburg by her sisters Aloysia and the widowed Sophie, who lived with her until their deaths. Constanze Nissen, widow Mozart, died in Salzburg in 1842 aged 80, and was buried beside her second husband in the Mozart family grave. She and her sons bequeathed all the Mozart memorabilia which had been in her possession to the foundation which became the Mozarteum.