Select these that apply as matters on which the Roman Catholic Church and the Eastern Orthodox Church agreed:
A. belief in one God
B. belief in Christ the Savior
G. the Gospels as Scripture
Some detail about what differed between the two sides and why they ended up splitting in what became known as "The Great Schism."
Mainly the Great Schism was caused by disputes over authority in the church. There were also doctrinal issues of dispute. For instance, the East objected to the addition of the Latin word "filioque" (meaning "and the Son") to the Nicene Creed, in which churches in the West confessed that the Holy Spirit proceeded from the Father and the Son (rather than from the Father alone, as confessed in the East). The West objected to the worship given to icons in the Eastern churches. There were also language differences, since Greek was the language of the church in the East and Latin the language of the church in the West.
Ultimately, though, the biggest reason was the struggle over authority in the church. In 1054 CE, there were mutual declarations of excommunication between the pope (in Rome) and the patriarch (in Constantinople) that resulted in "The Great Schism" -- a monumental split between the western church (the Roman Catholic Church and what has become known as the Eastern Orthodox Church. "Catholic" means universal -- the Roman pope was intent on asserting his leadership over all of Christendom. "Orthodox" means "right teaching." The Eastern patriarch and church were asserting their teachings to be right over against positions held in the West. There were a number of doctrinal issues debated hotly between East and West over the centuries leading up to final break between the two halves of the church. But more than anything, the split came down to "church power" -- who held control over the church.
The people are in charge of the government
Both were very large, both contained a multitude of different people and cultures.
2. Both were victims of their own success, that is they looked rich and looked very good for invasion when weak, and both in the end were destroyed by invaders from outside at times of strife.
3. In the end they both tried to reach too far and were stopped, in case of the Achamanids they invaded the Greek states, had huge problems in maintaining their invasions and supplying their forces, naval or land based. The same is for Romans when they were stopped by the Parthian “Persian” Dynastie, See battle of Carrhae. The Romans had no sea route to Persia and had to cross large tracts of land, their armies at the end of extremely long supply chains were defeated. And a lot of the time all the Persians had to do was cut of their supply routes, see the campaigns of Julian, or Mark Antony.
4. Both had great impact on their people’s lives and culture, be it religiously, linguistically or architecturally. See the use of large domes in buildings, a construction system innovated largely during the Parthian era. Religiously we can see the impact of ancient religions of the Persians on romans and consequently on Christianity, for example see “Mithraism” and its perpetuation from Persia into Rome, the disturbing similarities with Christianity. E.g. Mithra was called a “Son” of great god, had a virgin birth, walked among the people for a while, cured the sick etc.. died, was resurrected and then ascended into the heaven. What is interesting is that all Persians and Iranians celebrate the ascendant into heaven every year on March 20th which is very close to Easter. Nowrooz, is also celebrated in the republic of Azarbiegan, Uzbekistan, Tajikistan, Afghanistan, all Kurdish states, and a number of other states. By the way the word “istan” which means “the land of” is the root word for the English word “State”.