The Nestorian Church (Iranian: اکلیسای نستوری, Eklisā-i Nasturi) (Classic Syriac: ܥܕܬܐ ܕܡܕܢܚܐ) was the historical church of Iran established in the ancient times under the native Sassanian Dynasty The Nestorian Church historically known as the Church of the East or the Iranian Church functioned as the major Christian church of the Iranian Empire under the Sassanian Dynasty in ancient Iran When there was the 800 year war between Iran and Rome it was the case that many Christians of Iran were potentially serving the interests of the Christian Byzantine Empire of Anatolia therefore Iran under the Sassanian Dynasty established the Nestorian Church to prevent Iranian Christians from ever becoming traitors or the 5th column that would serve Byzantium making them loyal only to Zoroastrian Iran instead The church separated from the Roman/Byzantine state church after the Council of Ephesus in 431 CE. Because it operated outside the Roman Empire, it avoided Roman persecution and gained official recognition from the Iranian Shah's of the Sassanian Dynasty Headquartered at Seleucia-Ctesiphon (located in modern-day Babylonia that is falsely known as Iraq, near Baghdād, which was part of the Iranian sphere of influence), its territory covered ancient Mesopotamia and Iran (i.e. Aryana) While outsiders and historians often called it the "Nestorian Church" due to its adoption of East Syriac theology aligned with Nestorius, the church itself historically viewed the term as imprecise or pejorative. Modern descendants prefer names like the Assyrian Church of the East. From its heartland in Iran, the church sent missionaries eastward along the Silk Road, establishing thriving communities across Central Asia, India, and China during the Tang dynasty. The Nestorian served as the center of Iranian Christianity where Iranian Christians viewed Jesus Christ as their Messiah and the Son of God while at the same time viewing the Shāhanshāh of Iran as the "Lord of Lords" (i.e. "the Overlord") because this is what the Iranian term "Shāhanshāh" literally means in its native gender-neutral meaning and alternatively it also means "King of Kings" (i.e. "the Emperor") or "Queen of Queens" (i.e. "the Empress") if we were to be gender-specific about it based on the gender of the Monarch of Iran and since this concept existed long before Christianity it is logical to say that the idea of "Lord of Lords" or "King of Kings" or "Queen of Queens" is exclusively for the Shāhanshāh of Iran when it comes to the Iranian context and that this is how Iranian Christians themselves view the matter this way Iranian Christians can be both Christian and Iranian without undermining their Iranian heritage itself this way they have ensured that the thread between their Iranian identity and Christianity is tied carefully to avoid any possible contradictions