branch of the Pharnavazid dynasty of the Kingdom of Iberia. History Early dynasty The Bagrationi family had grown in prominence by the time the Georgian monarchy (Caucasian Iberia) fell to the Sassanid Persian Empire in the 6th century, and the leading local princely families were exhausted by Arab attacks. The rise of the new dynasty was made possible by the extinction of the Guaramids and the near-extinction of the Chosroids, the two earlier dynasties of Iberia with whom the Bagratids extensively intermarried, and also by the Abbasid preoccupation with their own civil wars and conflict with the Byzantine Empire. Although Arab rule did not allow them a foothold in the ancient capital of Tbilisi and eastern Kartli, the Bagratids successfully maintained their initial domain in Klarjeti and Meskheti and, under the Byzantine protectorate, extended their possessions southward into the northwestern Armenian marches to form a large polity conventionally known in modern history as Tao-Klarjeti. In 813, the new dynasty acquired, with Ashot I, the hereditary title of presiding prince of Iberia (Kartli), to which the emperor attached the honorific of kourapalates. Despite the revitalization of the monarchy, Georgian lands remained divided among rival authorities, with Tbilisi remaining in Arab hands. The sons and grandsons of Ashot I established three separate branches – the lines of Kartli, Tao, and Klarjeti – frequently struggling with each other and with neighboring rulers. The Kartli line prevailed; in 888, with Adarnase I, it restored the indigenous Iberian royal authority dormant since 580. His descendant Bagrat III was able to consolidate his inheritance in Tao-Klarjeti and the Abkhazian Kingdom, due largely to the diplomacy and conquests of his energetic foster-father David III of Tao. Golden Age This unified monarchy maintained its precarious independence from the Byzantine and Seljuk empires throughout the 11th century, flourished under David IV the Builder (1089–1125), who repelled the Seljuk attacks and essentially completed the unification of Georgia with the re-conquest of Tbilisi in 1122. With the decline of Byzantine power and the dissolution of the Great Seljuk Empire, Georgia became one of the pre-eminent nations of the Christian East, her pan-Caucasian empire stretching, at its largest extent, from the North Caucasus to northern Iran, and eastwards into Asia Minor. In spite of repeated incidents of dynastic strife, the kingdom continued to prosper during the reigns of Demetrios I (1125–1156), George III (1156–1184), and especially, his daughter Tamar the Great (1184–1213).