When Arabs conquered Armenia and Caucasus a new administrative and political unit formed known as Emirate of Armenia. This Emirate was divided itself to four subunits. Armenia I, II , III and also the special Emirate of Tiflis/Tbilisi. The internal borders were mostly the same as during the division of Armenia at 387 by Rome and Persia. So they not reflect necessarily ethnic borders but rather the political choices of Sassanian Persia. In fact it is during this period that the last Caucasian Albanian texts were written.While with the emergence of Tiflis Emirate many Iberians moved to west, where the nucleus of future unified Georgian kingdom emerged in the form of Tao-Klarjeti curopalate/kingdom.
Initially the Emirs were Armenians but later Arab Emirs were appointed.
Anyway the Emirate was enjoying large degree of autonomy.
The second map is the detailed one of the first. With Araibc terms. Made by Hewsen. While the third is the situation in 4th century made by the historian Armen Ayvazyan. It describes the lands that the four neighbors of Armenia, got from that division, which is known as Peace of Acilisene. Also important battles of 5th century. The most famous being the Avarayr battle.