The Apostles to the Slavs were Saints Cyril and Methodius. They were two brothers who were Byzantine Christian theologians and missionaries. They are credited with devising the Glagolitic alphabet and translating the Bible into the Old Church Slavonic language, thus spreading Christianity among the Slavic peoples.

The feast day of St. Cyril, brother of St. Methodius, is February 14. He shares the date with St. Valentine and several other saints.

St Methodius and St Cyril.

Cyril and Methodius were brothers who were Byzantine Christian theologians and missionaries. They are credited with creating the Glagolitic alphabet and translating the Bible into the Old Church Slavonic language, spreading Christianity among the Slavic peoples. They are considered the patron saints of Europe for their efforts in spreading Christianity and promoting literacy among the Slavic people.

Cyril Methodius Jansky has written:

'Principles of radiotelegraphy' -- subject(s): Telegraph, Wireless, Wireless Telegraph