It is believed to have been composed by him in 1490, when he was leaving his native town, innsbruck, to establish himself at the court of Emperor Maximilian I. It was set to the plaintive words, "innsbruck, ich muss dich lassen."
"The Story of Our Hymns"
Ernest Edwin Ryden
He had stopped at innsbruck to attend the theater and was in perfect health.
"The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons"
Jacques Casanova de Seingalt
Apart from this, I have not mentioned all the theatres; I have, for example, omitted Ratisbon, innsbruck, and others, although even the smallest theatres have attempted "Tannhauser;" Zurich also I have not mentioned.
"Correspondence of Wagner and Liszt, Volume 1"
Francis Hueffer (translator)