After the death of Heraclius in 1798, Vakhtang joined his mother Queen Dowager Darejan and brothers,
Iulon,
Parnaoz, and
Alexander, in opposition to his half-brother, King
George XII. The crisis was occasioned by George's renegation on the 1791 testament of Heraclius, requiring the king's successor to pass the throne not to his offspring, but to his eldest brother, thereby making Vakhtang the third in the line of succession, behind George and Iulon. George XII renewed Heraclius's quest for
Russian protection and obtained from
Tsar Paul I recognition of his son,
David, as heir-apparent on 18 April 1799. By July 1800, the kingdom faced the prospect of imminent civil war as the rival factions mobilized their loyal forces. Iulon, Vakhtang, and Parnaoz blocked the roads to Tbilisi and attempted to rescue their mother, Queen Dowager Darejan, who had been forced by George XII into confinement at her own palace in
Avlabari. The arrival of additional Russian troops under Major-General Vasily Gulyakov in September 1800 in Tbilisi made George XII's position relatively secure, but after his death in December 1800 the Russians prevented his heir David from acceding to the throne and went ahead with the outright annexation of Georgia to the Russian Empire. Vakhtang, who had by that time retired to his residence in
Dusheti, in the Aragvi valley, was suspected by the Russians of being responsible of sabotaging the Russian communications and being in touch with his rebellious brother Alexander, who had staged, with his
Avar allies, an abortive invasion of the eastern Georgian province of
Kakheti in November 1800. ==Arrest and exile==