Montserratensis Gr. 1 is a Greek manuscript whose existence was unknown. It was bequeathed to the Abbey of Montserrat (Barcelona) by Father Roca-Puig. The watermarks and the hands of its two scribes point to a dating to the second quarter of the 16th Century. It contains an nomocanon in a compilation for private use, and other texts of different kind : liturgical calendars and theological writings by Basilius of Caesarea, Cyril of Alexandria and John of Damascus.