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|Born||Johann Heinrich Köselitz|
January 10, 1854
|Died||August 15, 1918 (aged 64)|
|Other names||Peter Gast|
|Parents||Gustav Hermann Köselitz, Caroline Köselitz|
Köselitz was born in Annaberg, Saxony to Gustav Hermann Köselitz (1822–1910), the vice mayor (Vizebürgermeister), and his wife Caroline (1819–1900), a native of Vienna. His younger brother was the painter Rudolf Köselitz.
From 1872, Köselitz studied music with Ernst Friedrich Richter at the University of Leipzig. He transferred in 1875 to the University of Basel, where he attended the lectures of Jacob Burckhardt, Franz Overbeck, and Friedrich Nietzsche. In 1877, Köselitz sharply criticized the Basel music instructor Selmar Bagge in a newspaper article, which led to a minor scandal.
In Basel, a friendship developed between Köselitz and Nietzsche. Köselitz read for Nietzsche during the latter's intermittent spells of near blindness, and also took dictation. Köselitz was instrumental in the preparation of all of Nietzsche's works after 1876, reviewing the printer's manuscript and sometimes intervening to finalize the text formatting. Nietzsche's break with Wagner and his search for a 'southern' aesthetic with which he could immunize himself from the gloomy German north led him to over-appreciate Köselitz as a musician: 'I should not know how to get along without Rossini; even less, without my own south in music, the music of my Venetian maëstro Pietro Gast. As an amanuensis, however, Köselitz really was invaluable; writing apropos Human, All Too Human, Nietzsche claimed that Gast 'wrote and also corrected: fundamentally, he was really the writer whereas I was merely the author'. All the while, Köselitz worshipped his teacher, becoming involved with him to the point of self-denial.
In the spring of 1881, while staying together in Recoaro, Nietzsche created the pseudonym 'Peter Gast' for Köselitz. This was the name he was known by among the Nietzsche circle, as well as being the name under which he published all his operas. Peter Gast's most ambitious musical work is the comic opera in three acts The Lion of Venice (Der Löwe von Venedig). Throughout the 1880s, Gast and Nietzsche attempted without success to bring it to performance. It premiered in February 1891 in Danzig under the direction of Carl Fuchs, who exchanged letters with Nietzsche, but under its original title The Secret Wedding (Die heimliche Ehe or Il matrimonio segreto). In the 1930s, it would be shown once again under the title Nietzsche suggested, The Lion of Venice.
From 1899 to 1909, Köselitz worked in Elisabeth Förster-Nietzsche's "Nietzsche-Archiv" in Weimar. There, he was partly responsible for the selective and misleading editions of Nietzsche's work, most prominently, the so-called The Will to Power. Also, as Mazzino Montinari has pointed out, he consciously lied in his articles defending the "Archiv" against criticism. In 1909, Köselitz left the Archiv and never again spoke publicly about it; in private letters, he condemned Nietzsche's sister, as he had done prior to his working for her.
Köselitz was financed by his father, and also intermittently supported by Nietzsche's friend Paul Rée. In addition to being a musician and the editor of Nietzsche's writings and letters, he worked as a writer under various pseudonyms, including: Ludwig Mürner, Peter Schlemihl, Petrus Eremitus. He sent articles to many newspapers, and also wrote several short stories and fables.