Original: The ballet premiered on 25 May 1870 at the ThÃ Ã cents tre ImpÃ rial de lÂ OpÃ ra , with Giuseppina Bozzacchi in the principal role of Swanhilde .
Simplified: The ballet was first performed in 25 May 1870 at the ThÃ Ã cents tre ImpÃ rial de lÂ OpÃ ra in Paris .