I wrote:"The Eastern provinces yes [did speak Greek]. The emperors however, when Byzantium was established did not"
The official language of the emperors and the state was latin, until Heraclius, 3 centuries after Constatinople was established.
Emperors spoke Latin regardless of whether they knew Greek as part of their cultural education. And some only had a more basic grasp, or were versed in ancient Greek (to read the relevant literature) more than colloquial late antiquity Greek. Constantine for example had a basic command of Greek, but still needed translators for anything official.
I'm not sure what your point is? The eastern provinces were part of Rome.
>The emperors however, when Byzantium was established did not, as they came from latin speaking Roman elites (it was after all the eastern part created from the split of the Roman empire into two organizational units). It took a few centuries for the eastern emperors to speak Greek (and basically rise from the local elements).
Emperor Julian may have spoken Greek as his first language and he was emperor during the 300s.
Regardless, a large number of emperors knew Greek to varying degrees. Many of the Roman elites (in the West) knew Greek.
My point is those places had centuries of Greek-speaking established, and they spoke Greek.
I literally start with the point: "The Eastern provinces, yes [did speak Greek]", confirming the parent's ascertion that "they were speaking Greek the entirety of their time in the Roman Empire though?".
The educated and elite of Rome, nay, the majority of the Mediterranean would have spoken a form of Greek. Paul of Tarsus writes his letters now collected in the New Testament of the Christian Bible in Koine Greek; likewise the rest of the New Testament, as well as most of the writing of the Church Fathers, largely written by people from middle-class backgrounds.
Hence, the Germanic warlords who would come to be the ancestors of Western European aristocracy today, would come to speak Latin because they primarily were use to engaging the militaries of Rome, both as allies and as enemies, rather than the intelligentsia of Rome.
The Roman emperors spoke latin, and that was the language of the senate, army, and politics in general, as well as everyday life in Rome. A latin ancenstry was also a must for the most part - even supposedly "ethnic" emperors are usually just descendants of latin parents, Roman royalty or army deployed in some part of the empire.
That the elites also were taught Greek as a cultural thing is another matter. For cultivation it was ancient (attic) Greek that they read classical Greek texts in, not Koine. Byzantium had both: the people spoke Koine Greek, but the "higher education" Greek in which "serious" literature and treatises was written, and which was taught, was attic, the Greek dialect of ancient Athens.
The population in the whole eastern part of the Empire, did speak Koine Greek, a big majority as their native tongue, and others as a trade language (or in older Greek settlements). The latter that was more commonly the case for the western provinces when it came to Greek too.
Were Roman soldiers of west less Roman than Helenized-yew?
What the Emperor's ethnic/cultural background is, and what the general populace spoke are two different things.
If we want to use that analogy, then let's look at the Ottoman sultans. The first few Ottoman sultans were primarily of Central Asian Turkic ethnic makeup, however every one of them had a policy of having children with women who were Christians of either Greek, Circassian, Balkans/Caucus, and later Polish backgrounds.
That means that very quickly, the average Ottoman sultan was almost entirely a blend of Greek/Balkan/Circassian and a very small percentage actually of Turkic ethnic makeup. Does that mean that the Ottoman empire for most of its existence was a Greco-Caucasian Empire, rather than a Turkish one?
The emperors however, when Byzantium was established did not, as they came from latin speaking Roman elites (it was after all the eastern part created from the split of the Roman empire into two organizational units). It took a few centuries for the eastern emperors to speak Greek (and basically rise from the local elements).