The Ancient Greek, Persian, and Roman empires each influenced each other's way of life through a myriad conflicts and innovations. Each empire underwent cultural innovation through artistic expression. Each three empires had their own unique governmental structures, and expanded their empires. Lastly, internal conflicts among within the Roman, and Sassanian Empires coerced both empires to shift to monotheism. Ultimately, each empire fate was predicated upon its relations with one another. The Ancient Greeks were comprised of various autonomous city-states with the largest being
Athens and Sparta (von Sivers, Desnoyers, and Stow 185). Each Greek city-state had little connections among each other than than Greek language and culture. As
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Largely due to political instability, both empires sought to establish a state religion (von Sivers, Desnoyers, and Stow 195). For instance, in Rome during the reign of Constantine I constructed the Council of Nicea in 325 to issue the Nicene Creed as a doctrine for Christianity (von Sivers, Desnoyers, and Stow 195). In Persia, Shapur II sponsored Zoroastrian priests to write the Gathas holy scripture (von Sivers, Desnoyers, and Stow 195). Furthermore, Rome became a Christian empire by 380 BCE and Persia became a Zoroastrian empire in 350 BCE, as both empires sought to unify its populace (von Sivers, Desnoyers, and Stow 195). The three empires of mentioned underwent various developments throughout this era. First, each empire’s cultural expansion led to the development of arts and philosophy. Next, each empires governmental structure dictated its internal and external relations. Third, the expansion of these empires both expanded each empire's territory and led to various armed conflicts. Finally, the Roman and Sassanid empire’s internal conflicts pushed the two empires to establish monotheism to curb internal conflicts within their empires. In the end, these three empires had a tremendous influence on the