A number of short treatises in the so-called Anonymus Treu (Par. suppl. gr. 607A) have been attributed by scholars to John Lydus’s partially lost work On the Months. This article describes the manuscript, localises its position with regard to the related textual tradition in Lips. gr. 72, the Suda and the Patria of Constantinople, and scrutinises the attributions. We also have a look at the traditions of excerpts from On the Months in Cedrenus and in some glossaries and we discuss their relation to the group around the Anonymus Treu. The great importance the last editor of On the Months, Richard Wünsch, gave to this section of his stemma is explained and his conclusions are revised.