This might be of interest to those looking for ciphers and codes in the relevant period and might add to what we know of the literary culture.

I have not yet accessed this recent research. As we know, the Vaticanus graecus 1291 (Ptolemy's Canones), noted for a possible link to the Voynich, was kept by the bishops of Brescia. New documents reveal codes by Francesco Marerio, bishop during the relevant window.

The translation of the abstract is poor, but  "open to humanistic innovations also in the graphic field" is an enticing statement worth pursuing, in the context. It suggests a culture of experimentalism. 

Has anyone accessed this work or know of Bishop Marerio's interests in "codes" and "humanistic innovations also in the graphic field" or shed any light on Marerio?

Il vescovo di Brescia Francesco Marerio e i suoi codici
The bishop of Brescia Francesco Marerio and his codes
Carla Maria Monti


Abstract

[Autom. eng. transl.] The article reconstructs the biography of Francesco Marerio, and in particular the events linked to his long Brescia bishopric, with the help of new archival documentation and the unpublished testimony of a literary work, the Itinerarium by Bartolomeo Baiguera. The Appendix provides the edition of the 96 final verses of the long poem dedicated to the prelate. The three codes identified so far belonging to Marerio, one of which [he] autographs, are also studied, which provide significant clues about his culture, open to humanistic innovations also in the graphic field.

In Italian, "codici" is the plural form of "codice," which refers to "codex" or "manuscript" in English.

"The Bishop of Brescia, Francesco Marerio, and his codices."

Thanks Nablator. I was following the translation without realizing it was an auto-translate - which consistently renders "codes" (as do other searches for the article.)  You'll find 'Newly discovered codes...'