St. Cyril and St. Methodius
- Mission to the Slavs mid-9th century CE
- Developed Cyillic writing for Slavic language
- Education facilitated conversion to Orhtodox Christianity
The conversion of the Slavs to Orthodox Christianity was an outgrowth of the rivalry between Rome and Constantinople for supremacy in the Christian World that ultimately led to the Schism that split Christianity into Roman Catholic and Eastern Orthodox branches.