Claim: Italo Gardoni was one of the cast members in the opera, I Masnadieri, which premiered on July 22, 1847.
Evidence: On 22 July 1847 he created the tenor role in Verdi's I masnadieri opposite Lind, Lablache and Filippo Coletti, the first two nights being under the composer's baton, and thereafter under Balfe's. 
22 July 1847 (1847-07-22)
Her Majesty's Theatre, London Italo Gardoni