Christianity spread in Dvaleti from the middle of the 6th century. Later Dvaleti was included in the Episcopal Diocese of Nikozi. Roads from the Transcaucasia to the North Caucasus passed through Dvaleti. In the Middle Ages, the "Road to Dvaleti" was known. The fortification of the Dvaleti valleys from the north was of great importance for Georgia Kingdoms. After the Mongol invasions in 13th century Dvaleti was inhabited by Ossetian refugees from the north. The indigenous population of Dvaleti (Dvalebi), in turn, moved en masse to the south of the Caucasus. Even after the collapse of the unified Kingdom of Georgia in 15th century, Dvaleti was part of the Kingdom of Kartli. At the beginning of the 17th century Dvaleti was ruled by Giorgi Saakadze. Famous Dvali figures include 11th century clergymen: Michael Dvali, John Dvali and Svimon Dvali.According to Johann Anton Güldenstädt In 18 century Dvaletia was an Ossetian province in the upper reaches of the Ardon River[3]
Historical monuments of Dvaleti that survived till modern times include forts built at the headwaters of the rivers Ardon and Fiagdon — Kasris-karma and Khilka. The ruins of Christian temples in the valleys of Zrogo [ka] and Mamison (Zhghele [ka])