[RegulatorCountry]

Their ancestors were Eastern Orthodox.

[vladimir998]

“Their ancestors were Eastern Orthodox.”

No, they were not. Even in the days of Sts. Cyril and Methodius they were Catholic because Cyril and Methodius were Catholic. They received approval from the pope to have the liturgy in the native language, for instance. Cyril died in Rome as a monk.

[Cronos]

Not really. Moravians were not converted by Cyril and Methodius. the first Christian Church was built by Bishop Adalram of Salzburg in Pribina. This was in 828, so pre-dating the schism

Cyril and Methodius were part of a united Church so when they came, they were not converting from the bishop of Salzburg as both the Bish of Salzburg and Cyril and Methodius were of the same Church

The Moravians then were brought into the German Holy Roman Empire -- in reality the Western half voluntarily joined the HRE while the eastern (Slovakia) was under the initially pagan Magyar

So, in short your Moravian ancestors were originally pagan, then converted by the joint Church (pre-Schism) and then were in the Catholic Przymyslid or Germanic realms or under the Magyar. The "Moravian Church" was mostly formed from the western moravians (i.e. under the Germans) from whence some of your ancestors come

They were initially Catholic in that sense, never Eastern Orthodox.