Moreover...
Moreover, in the 6th year of (Hijra) migration, namely six years after the prophet's immigration to Medina, he wrote letters all of which are found in historical records namely .
to Khusrow Parviz King of Persia, Heraclius[^2] ruler of a part of the Roman Empire, Mequqass ruler of Egypt,[^3] Najashi (or Negus) ruler of Abyssinia,[^4] Ruler of Ghassan as a deputy of Rome,[^5] and to the ruler of Hira of the tribe of AI-e-Mundir and a vice regent of the throne of Iran, inviting all of them to accept Islam.
Thus it becomes apparent that in order to know the background of the rise of Islam, we cannot con fine ourselves to Mecca, Medina and Ta'if, or to the Arab Lands but expand our view to at least include all such regions as the Prophet himself called to accept Islam in his own time. A brief description of Arabia The name Arabia is applied to a land populated by Arabic-speaking people.
At the time of the birth of the Prophet, the Arabic-speaking region was not so vast as it is to-day; on one side it was bounded by the Persian Gulf much as it is to-day, since at that time, too, the southern borders of the Persian Gulf were inhabited by Arabs In Iraq the boundary was almost along the Tigris and the Euphrates namely that side of the Tigris where Arabic is now the main language In the region between Iran and the Tigris the main language was not Arabic, but Kurdish, Persian and some local dialects with Arabic as the main language that side of River Tigris.
In fact the Arabs now inhabiting Khuzestan are not the original inhabitants but migrated to this region after Islam. In the north were the present countries of Shaam or Syria and Jordan where a number of Arab migrant tribes lived in the time of Islam, the period of that migration will be explained later. In the north, too, Arabic was not, unlike to-day, the main language, though a considerable Arab migrants had settled in the valley of the Jordan River.
It may be observed that at present the Arab land, have extended as far as Turkey, whereas at that time it was limited more to the south towards Jordan. The present Lebanon and Syria were not Arabic speaking. In Jordan, too, Arabic was not the main language, and only the Arab migrants spoke Arabic. In this respect Jordan resembled the present Khuzestan where a group speak Arabic and another speak Persian.
In the west, in a significant part of Africa where Arabic is now spoken, the main language at the time was not Arabic.