This book has alot of nice finds.
1. Basil the Macedonian Emperor of the Byzantine Empire was a Slav.
2. Cyril and Methodius were natives of Salonika and were of Slavic decent.
3. There was a Macedonian dialect of Slavonic.
All this written in a book from 1862!
From the book “History of the Christian Church” Volume II Part 1, By James Craigie Robertson, 1862, page 369, 385 and 386.