A large Russian force now arrived and took Derbent, Shemakha, Baku, and several other fortresses in Daghestan, but the death of the Empress Catherine in 1796 put an end to the campaign, for Tsar Paul recalled all the troops from Transcaucasia. In 1797 Aga Mahmad Khan was again marching against Georgia, when he was fortunately assassinated, like his predecessor Nadir. Plague and famine came to slay those who had escaped the sword of the Persians, and, worst of all, the great Irakli died in January, 1798, at the age of eighty, after a career almost unparalleled in history. Frederick of Prussia might well say, "Moi en Europe, et en Asie l'invincible Hercule, roi de Géorgie." Giorgi now succeeded to the throne, and entered into negotiations with Persia, but Tsar Paul heard of the proposed alliance and outbid the Shah. A treaty was signed, confirming the throne to the Bagratid dynasty for ever, and promising military aid whenever it might be necessary. Alexander, the king's brother, now raised a revolt, which was put down with the help of the Russians; after all he had a grievance, for Irakli's will declared that he was to succeed Giorgi, while the Russians had persuaded the king to appoint as his heir his son David, a major-general in the Russian army. Alexander now appealed to Persia for aid, which he obtained, and in a three hours' battle at Kakabeti, on the Iora, he and Omar Khan, with an army of 12,000 men, were defeated. Giorgi died in 1800, and Georgia was then formally incorporated in the Russian empire. General Knorring, the first governor, proceeded to the country with 10,000 men, and in the following year, under Tsar Alexander I., the annexation was confirmed. In 1803 Prince Tsitsishvili, a Georgian, succeeded Knorring. By his advice all the royal family were summoned to Russia, "in order to prevent civil dissensions," and this removal was accompanied by a very unfortunate incident. Queen Maria, widow of Giorgi, refused to go; General Lazarev proceeded early one morning to the queen's sleeping apartments with some soldiers and attempted to force her to accompany him; she killed him with a dagger which she had concealed under her dress, and her young son and daughter stabbed some of the soldiers. They were, of course, overpowered and carried off; at Dariel, in the narrowest part of the pass, a few Tagaur Ossets made a vain attempt at a rescue. Queen Maria was kept imprisoned in a convent at Voronezh for seven years, and never saw her native land again.