order to reunite all the territories of Iberia, a goal he seems to have accomplished. But Emperor Heraclius's offensive in 627 and 628 brought victory over the Georgians and Persians and ensured Byzantine predominance in western and eastern Georgia until the invasion of the Caucasus by the Arabs. Arab period and restoration of the kingship The Arabs reached Iberia about 645 and forced its eristavi (prince), Stephanoz II (637 – c. 650), to abandon his allegiance to Byzantium and recognize the Caliph as his suzerain. Iberia thus became a tributary state and an Arab emir was installed in Tbilisi about 653. At the beginning of the 9th century, eristavi Ashot I (813–830) of the new Bagrationi dynasty, from his base in southwestern Georgia, took advantage of the weakening of the Arab rule to establish himself as hereditary prince (with the Byzantine title kouropalates) of Iberia. A successor, Adarnase IV of Iberia, formally a vassal of Byzantium, was crowned as the “king of Iberia” in 888. His descendant Bagrat III (r. 975–1014), brought the various principalities together to form a united Georgian monarchy. Eastern and Western Iberians The similarity of the name with the old inhabitants of the Iberian peninsula, the 'Western' Iberians, has led to an idea of ethnogenetical kinship between them and the people of Caucasian Iberia (called the 'Eastern' Iberians). It has been advocated by various ancient and medieval authors, although they differed in approach to the problem of the initial place of their origin. The theory seems to have been popular in medieval Georgia. The prominent Georgian religious writer George the Hagiorite (1009–1065) wrote about the wish of certain Georgian nobles to travel to the Iberian peninsula and visit the local Georgians of the West, as he called them. See also Georgian monarchs family tree of Iberia Colchis Roman Georgia Sasanian Iberia References Sources Further reading Roger Rosen, Jeffrey Jay Foxx. Georgia: A sovereign country of the Caucasus Thomson, Robert W. Rewriting Caucasian History (1996) Braund, David. Georgia in Antiquity: A History of Colchis and Transcaucasian Iberia, 550 BC-AD 562 (New York: Oxford University Press, 1994) Lang, David Marshall. The Georgians (London: Thames & Hudson, 1966) Toumanoff, Cyril. Studies in Christian Caucasian History. Washington D.C.: Georgetown University Press, 1963 Edward Gibbon, Volume II, Chapter XLII, discusses Iberia as one of the areas in the "Barbaric world" States and territories established in the 4th century BC 580 disestablishments