357.
The Savannah and Altamaha rivers and the wide and deep lands between fell in that grant of Charles II's to the eight Lords Proprietors of Carolina--Albemarle, Clarendon, and the rest.

But this region remained as yet unpeopled save by copper-hued folk.

True, after the "American Treaty" of 1670 between England and Spain, the English built a small fort upon Cumberland Island, south of the Altamaha, and presently another Fort George--to the northwest of the first, at the confluence of the rivers Oconee and Oemulgee.

There were, however, no true colonists between the Savannah and the Altamaha.
In the year 1717--the year after Spotswood's Expedition--the Carolina Proprietaries granted to one Sir Robert Mountgomery all the land between the rivers Savannah and Altamaha, "with proper jurisdictions, privileges, prerogatives, and franchises." The arrangement was feudal enough.

The new province was to be called the Margravate of Azilia.
Mountgomery, as Margrave, was to render to the Lords of Carolina an annual quitrent and one-fourth part of all gold and silver found in Azilia.