"Tristan und Isolde" proved to be a difficult opera to stage, and Wagner considered various possibilities for the venue. In 1857 he was invited by a representative of Pedro II, Emperor of Brazil, to stage his operas in Rio de Janeiro (in Italian, the language of the Imperial Opera); he told Liszt he was considering settling in Rio, and that that city would be given the honour of premiering "Tristan". Wagner sent the Emperor bound copies of his earlier operas in expression of his interest, but nothing more came of the plan. He then proposed that the premiere take place in Strasbourg, following interest in the project shown by the Grand Duchess of Baden. Again, the project failed to eventuate. His thoughts then turned to Paris, the centre of the operatic world in the middle of the 19th century. However, after a disastrous staging of "Tannhäuser" at the Paris Opéra, Wagner offered the work to the Karlsruhe opera in 1861.