This short article examines a Greek manuscript fragment which was recently discovered in the archive of the basilica of St. Caterina d’Alessandria in the Apulian city of Galatina (province of Lecce). It is a single sheet of parchment on which an excerptum and a portrait of Constantine the Great have been copied from the famous Venice manuscript Marc. gr. Z 402 (coll. 1031, Italo-Greek manuscript?), containing Michael Glycas’ Χρονικὴ σύντομος ἐπισύναξις.