Georg Nikolaus von Nissen

Snapshot

A Danish diplomat who married Mozart’s widow and moved to Salzburg to write the first comprehensive Mozart biography. Georg Nikolaus von Nissen died before it was published and was buried at Sebastiansfriedhof, a few metres from Leopold Mozart’s grave.

The Story

Georg Nikolaus von Nissen came to Mozart through Constanze Mozart. He was a Danish diplomat posted in Vienna who became a close friend to the composer’s widow in the years after Mozart’s death, and the friendship deepened into marriage. They wed in Copenhagen in 1809, and Nissen spent years gathering material for a life of the composer he had come to know through the woman who had lived that life beside him.

In 1824 the couple moved to Salzburg. Nissen wanted to be near the city that had formed Mozart, with access to Salzburg-held archives and the network of people who had known the family. He worked through stacks of letters, catalogued manuscripts, and drew heavily on Constanze’s direct recollections. The project consumed the last years of his life. He died in Salzburg on 24 March 1826, before the book was finished.

Constanze Mozart hired a Dresden physician, Johann Heinrich Feuerstein, to complete the work, and the Biographie W. A. Mozarts was published in Leipzig in 1828. Over 900 pages long, it remains a foundational document in Mozart scholarship, even if later historians have noted inconsistencies and the influence of Constanze’s wish to protect her late husband’s reputation. Modern scholars treat it as an essential but partial source: the best available record of much that would otherwise be unrecoverable, shaped by the grief and loyalty of the woman who gave it its raw material.

Nissen is buried at Sebastiansfriedhof in Salzburg, a few metres from Leopold Mozart’s grave. The proximity is coincidence, but it gives the cemetery an unusual density of Mozart-story figures. A street in Salzburg’s Gneis district bears his name.