This project looks at the reproduction of one mid-12th-century Roman text by analyzing sixteen versions of it that still exist, copied from c. 1160 through c. 1325. The author was Nicolaus Maniacutius, a cleric at St. John Lateran Basilica in Rome. That original copy is lost, but versions quickly appeared in monasteries and cathedrals in Italy, Germany, France, and England. Somehow, through networks of communication and travel, reproductions were made and collected by prominent monasteries and churches, and by the Guildhall, a secular institution in the City of London