Yet within the Moravian state there was a Frankish party among the nobility who desired closer ties with East Francia, whose ruler, Louis the German, was Ratislav's nominal suzerain, and a Frankish bishop had ecclesiastical jurisdiction over a small part of Ratislav's domain that had earlier converted to Christianity.

When an appeal of the ecclesiastical issue was made to Rome, Nicholas summoned both Cyril and Methodius and the complaining Frankish parties to his court to hear them out.

Nicholas died before their arrival, but the new Pope Adrian II reached a compromise after hearing both sides: Old Church Slavonic was confirmed as a liturgical language alongside Greek, Hebrew and Latin, and Methodius was confirmed as bishop with a Frankish co-adjutor, Wiching.

The expelled, led by Clement of Ohrid and Naum of Preslav, were of great importance to the Eastern Orthodox faith in the already Christian from year 864 Bulgaria, after they were released from prison and escorted to the Danube.

A major event that strengthened the process of Christianization was the development of the Cyrillic script in Bulgaria at the founding by Naum and Clement of the Preslav Literary School in the 9th century.

In the spirit of Eastern Orthodox revival, many people in the region left the Uniate (Greek Catholic) Church.

On September 25, 1921, Archimandrite Gorazd was consecrated Bishop of Moravia and Silesia at the Cathedral of the Holy Archangel Michael in Belgrade, Yugoslavia, by Serbian Patriarch Dimitrije.

He provided aid to those in Slovakia and Carpatho-Rus', which then was part of Czechoslovakia, and who wanted to return to Eastern Orthodox Faith from the Unia, Union with Rome.

In the same year, after the First Vienna Award, southern parts of Slovakia and Carpathian Ruthenia were annexed by Hungary.

In 1939, Nazi Germany annexed the remainder of the Czech lands into the Protectorate of Bohemia and Moravia and installed a pro-Nazi regime in Slovakia.

At the same time, Hungary occupied the rest of Carpathian Ruthenia and in 1941 Hungarian authorities arrested bishop Vladimir Rajić and deported him back to Serbia.

After the May 27, 1942 assassination attack on Heydrich's car in Prague, Czech and Slovak partisans took refuge in the crypt of the Ss.

The Orthodox priests, laymen, and Bishop Gorazd were arrested and killed by firing squads on September 4, 1942.

[15] Churches and chapels were closed, and a rounding up of Czechs was conducted, including the whole village of Lidice, whose inhabitants were either killed or sent to forced labor camps.

[18] When the Communists came to power in April 1950, the government convoked a synod of the Slovak Greek Catholic Church in Prešov, where five priests and a large number of laymen signed a document declaring that the union with Rome was disbanded and asking to be received into the jurisdiction of the Moscow Patriarchate, later the Orthodox Church of Czechoslovakia.

Nicholas reposed (died) on January 30, 2006, and was replaced by Archbishop Christopher of Prague and the Czech Lands (elected May 2, 2006).

The Orthodox Theological Faculty of the University of Prešov provides an education for future priests of combined Church.

The current primate of the Czechoslovak Orthodox Church is Rastislav of Prešov [cs] (born Ondrej Gont), Metropolitan of the Czech Lands and Slovakia since 2014.