He set himself up as a rival king in the West in 800 AD, and this offensive act caused the beginning of tensions between the Orthodox Emperor in Constantinople and the barbarian rulers of the West. This increased the separation and differences between the Latin West with the Orthodox East and eventually led to the Great Schism of 1054 AD.
I see a lot of domes on Orthodox churches but rarely see them on Catholic churches.
The Orthodox Churches and the Catholic Church were once united. The Orthodox Churches separated from the Catholic Church over political and doctrinal differences.
Charlemagne has not been canonized in the Latin Church, he has been beatified. He is considered a saint in the Orthodox Churches, however.
the Eastern Orthodox Church and the Roman Catholic Church
No, Orthodox churches are where persons of Greek or Russian Orthodox faith worship. Like the Church of England, the Orthodox also separated from the Roman Catholic Church on matters of doctrine.
Greek Orthodox chuches, Catholic churches in Europw
In most Catholic & Orthodox Churches.
The two churches were the Eastern Orthodox and the Roman Catholic
The catholic church is sometimes considered the collection of churches that developed out of the Great Schism (namely, the Roman Catholic Church and the Eastern Orthodox Church). Although I have never heard someone use the term "catholic orthodox church," I would consider it to be referring to the Eastern Orthodox Christian religion.
No. Many Protestant and Orthodox churches also name their parishes for saints.
Catholic.
The Catholic and Orthodox churches recognize them still.