May 11 (Eastern Orthodox liturgics) - Wikipedia
https://en.wikipedia.org/wiki/May_11_(Eastern_Orthodox_liturgics)
Jump to Saints - ... the Slavs (869, 885); Saints Clement of Ohrid, Sabbas, Angelarius, Gorazd, and Naum of Preslav — Disciples of Saints Cyril and Methodius and missionaries of the Slavs, Wonderworkers and Equal-to-the-Apostles (9th century); Saint Rostislav the Prince of Great Moravia, Confessor of the Faith (870)
Naum of Ohrid - Revolvy
www.muncharoo.com/topic/Naum%20of%20Ohrid&item_type=topic
He was among the disciples of Saints Cyril and Methodius and is associated with ... and Methodius , Clement, Angelarius, Gorazd and other Slavic missionaries in 863. ... Apostles of the First Bulgarian Empire and missionary among the Slavs. ... In this years the Cyrillic script was created in the Preslav literary school, and ...