Between Rienzi and Iphigénie en Aulide, which premiered earlier ?
Rienzi: Rienzi, der Letzte der Tribunen ("Rienzi, the Last of the Tribunes"; WWV 49) is an early opera by Richard Wagner in five acts, with the libretto written by the composer after Edward Bulwer-Lytton's novel of the same name (1835). Rienzi:  Written between July 1838 and November 1840, it was first performed at the Hofoper, Dresden, on 20 October 1842, and was the composer's first success. Iphigénie en Aulide:  It was premiered on 19 April 1774 by the Paris Opéra in the second Salle du Palais-Royal and revived in a slightly revised version the following year.
i don't know