what church did St. Cyril and St. Metho.came from?

I have read about two Christian missionaries who brought Christianity from the Byzantic Empire to the Slavic countries.

But what Church did they belong in the Byzantic Empire?

I have done a search for it online, the only thing I found is that they brought Orthodoxy. That doesn't indicate a church name to me.

http://en.wikipedia.org/wiki/Saints_Cyril_and_Methodius

Edited by younghistorian - 13-May-2015 at 14:10

In that time christian chrurch was one,the church before the schism.Schism came in 1054.

Edited by medenaywe - 14-May-2015 at 00:40