Question: Which was written first, Boris Godunov or La vida breve?
Sentence (from "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".
Relevant evidence: Yes