 Complete the following phrase:  The second half of the 18th Century saw a new dynasty take hold in Iran. The new Qajar dynasty was founded on slaughter and plunder of Iranians, particularly Zoroasterian Iranians. The Qajars, under their dynasty founder, Agha Mohammad Khan plundered and slaughtered the aristocrats of the previous Zand Dynasty. Following this, Agha Mohammad Khan was determined to regain all lost territories following the death of Nadir Shah. First on his was the Caucasus, and most notably Georgia. Iran had intermittently ruled most of the Caucasus since 1555, since the early days of the Safavid Dynasty, but while Iran was in chaos and tumult, many of their subjects had declared themselves quasi-independent, or in the case of the Georgians, had plotted an alliance with the Russian Empire by the Treaty of Georgievsk. Agha Mohammad Khan, furious at his Georgian subjects, starting his expedition with 60,000 cavalry under his command, defeated the Russian garrisons stationed there and drove them back out of the entire Caucasus in several important battles, and completely 