650 AD. Divergence of Megrelian and Laz
According to the results of lexico-statistical reconstruction of the evolution of Kartvelian languages, Klimov 1959 [1], the divergence of Megrelian and Laz (Chan) languages began around 650 AD.
[1] On the glottochronological method of dating the breakup of the proto-language. Klimov 1959
670 AD. Sarmatians G2a in Bavaria
In Bavaria, a burial of six heavy cavalrymen, cataphracts, was discovered. The burial dates to 670 AD. Four of the six belonged to haplogroup R1b, two to G2a (the main one for the Western Caucasus), next to which are horse burials, sacrificed to the deceased in Sarmatian fashion (head and legs neatly arranged). (Vanek 2009)
More about the Sarmatians.
690—710 AD. Arab invasion of Transcaucasia
End of the 7th — beginning of the 8th centuries — the Arab invasion of Transcaucasia, the placement of military garrisons on the territory of Apsilia.
Materials:
"History of Abkhazia in Dates." T.A. Achugba 2011