According to the 11th-century chronicler Sumbat Davitis-Dze, Bagrat died on April 20, Easter Sunday of the year 129 of the Georgian era (i.e., 909 AD).
[1] Bagrat was a younger son of Sumbat I, founder of the Klarjeti line of the Bagratids.
Upon Sumbat’s death in 889, he succeeded his father as prince of Klarjeti, while his elder brother (and likely a legitimate successor to Sumbat), David, appear as a ruler of some less important territory north of Klarjeti – Adjara and Nigali.
In 891, he became involved in the dynastic feud among the Bagratids and helped Adarnase IV to defeat Gurgen I.
On Bagrat's death Artanuji seems to have been retrieved by his brother David, while the rest of his territory was further divided between his four sons, who soon started quarrelling amongst themselves.