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The Bagratuni, Bagratid or alternatively Pakradouni royal dynasty of Armenia was a royal family whose branches formerly ruled many regional polities of the medieval Kingdom of Armenia.

[link to en.wikipedia.org]

The Bagrationi Royal Dynasty was the ruling family of Georgia.

According to a family legend, taken down by the 11th century Georgian chronicler Sumbat Davitis-Dze, and supplied much later by Prince Vakhushti Bagrationi with chronological data, the ancestors of the dynasty traced their descent to the biblical king and prophet David and came from Palestine around 530 AD.

Tradition has it that of seven refugee brothers of the Davidic line, three of them settled in Armenia and the other four arrived in Kartli (a major Georgian region also known as Iberia by Classical authors) where they intermarried with the local ruling houses and acquired some lands in hereditary possession.

One of the four brothers, Guaram, allegedly gave an origin to a line subsequently called Bagrationi after his son Bagrat. A successor, Guaram, was installed as a presiding prince of Kartli under the Byzantine protectorate and bestowed, on this occasion, with the Byzantine court title of Kouropalates in 575. Thus, according to this version, began the dynasty of the Bagratids, who ruled until 1801.

[link to en.wikipedia.org]

The ancestors of the Armenian-Georgian family of Bagration, the first family entered in the list of the Russian nobility (published by Count Aleksandr Bobrinsky, under the title "Dvoryanskie Rody," St. Petersburg, 1890).

The Bagratians or Bagratuni claim to be descendants of King David of Israel. Moses of Chorene wrote his "History of Armenia" at the request of Isaac Bagration (Sahak Bagratuni) in the middle of the fifth century. This historian gathered his information from the Syrian historian Mar Abbas Katina, who, according to Emin, lived about 150 B.C., and, according to others, in the third century C.E. Moses states that King Hracheye (fierce eyes) joined Nebuchadnezzar in his first campaign against the jewish people, and took part in the siege of Jerusalem. From among the captives he selected the distinguished Jewish chief Shambat or Smbat (Sabbat) and brought him with his family to Armenia. From this Shambat the Bagratuni claim descent;

[link to www.jewishencyclopedia.com]