Which opera premiered first, Mefistofele or Gawain?
Mefistofele: Mefistofele (] ) is an opera in a prologue, four acts and an epilogue, the only completed opera with music by the Italian composer-librettist Arrigo Boito (there are several completed operas for which he was librettist only). Gawain (opera):  The opera was a commission from the Royal Opera House, London, where it was first performed on 30 May 1991.
i don't know