Which was written first, Boris Godunov or La vida breve?
Boris Godunov (opera): Boris Godunov (Russian: Борис Годунов , "Borís Godunóv") is an opera by Modest Mussorgsky (1839–1881). Boris Godunov (opera):  The work was composed between 1868 and 1873 in Saint Petersburg, Russia. Boris Godunov (opera):  Its subjects are the Russian ruler Boris Godunov, who reigned as Tsar (1598 to 1605) during the Time of Troubles, and his nemesis, the False Dmitriy (reigned 1605 to 1606). Boris Godunov (opera):  The Russian-language libretto was written by the composer, and is based on the drama "Boris Godunov" by Aleksandr Pushkin, and, in the Revised Version of 1872, on Nikolay Karamzin's "History of the Russian State". La vida breve:  It was written between August 1904 and March 1905, but not produced until 1913.
Boris Godunov