The two brothers were born in Thessalonica, in present-day Greece – Cyril in about 827–828 and Methodius about 815–820.
Οι δύο αδελφοί γεννήθηκαν στη Θεσσαλονίκη, ο Κύριλλος περίπου 827–828 και ο Μεθόδιος 815–820.