In some cases, this name was used not only with regard to the contemporary Middle Bulgarian language of the copyist but also to the period of Old Bulgarian. A most notable example of anachronism is the Service of Saint Cyril from Skopje (Скопски миней), a 13th-century Middle Bulgarian manuscript from northern Macedonia according to which St. Cyril preached with "Bulgarian" books among the Moravian Slavs.
The term "Bulgarian" was applied to both the contemporary Middle Bulgarian language of the copyist and the Old Bulgarian period, as seen in a 13th-century manuscript from northern Macedonia that depicts St. Cyril preaching with "Bulgarian" books among the Moravian Slavs.