Jan Dismas Zelenka´s “Missa Dei Filii” is the second of three transmitted “Missae ultimae,” but consists, like other “short masses” of the 18th century, solely of a Kyrie and Gloria. Nevertheless, it is an extensive work, and the lengthy, multipartite Gloria is considered as the most impressive Gloria setting that Zelenka created in his over 20 masses. What remains to be answered is whether Zelenka had originally planned a complete mass composition.