What is "bakhtrioni"

Bakhtrioni (, bɑχtʼrɪɔnɪ) is a ruined 17th-century fortress in the eastern Georgian region of Kakheti, on the left bank of the Alazani river near its confluence with the Ilto. The fortress served as an Safavid Iranian outpost in the 1650s until the rebellious Georgians captured and demolished it. Only insignificant ruins of the Bakhtrioni fortress have survived.