: The newly discovered copy of a fragment of the score of Don Giovanni, surviving in the music collection of the Premonstratensian monastery at Strahov, in Prague, consists of seven of eleven numbers and five of fourteen recitatives of the second act of the opera. The paper shows that the score was written in the Prague copying workshop of Anton Grams, from which also originated the so called 'Donaueschingen score'. It was probably copied from Donebauer's score. From Strahov score was copied Donaueschingen score or both scores were written simultaneously. The Prague copy of the so called ‘Lobkowitz score', and also the Stuttgart score, were used for comparison.