There is no record that shows the ethnicity of St. St. Cyril and Methodius. They are noted in history as citizens of the East Roman Empire, that’s it. There are many speculations, but no country can claim them as their own with much certainty.
Geographically, they were from the Macedonian city of Salonika, and in the 'Life of Methodius' (St Clement, 9th/10th century) the East Roman Emperor Michael III is clearly recorded as stating that all people of that city speak Slavonic. That is an ancestor tongue of Macedonian today. Culturally, they were like others in Macedonia and much of the Balkans, they were East Romans and they were Christians.
Greeks have no linguistic connection, real Bulgars don't either, and that which the later Bulgarian 'Slavs' have is largely due to influence that comes from Macedonia and Macedonian people. In all logic and probability, SS Cyril and Methodius are ancestors of the Macedonian people that exist today.
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