Nader Shah invaded India and sacked far off Delhi by the late 1730s. His territorial expansion, as well as his military successes, went into a decline following the final campaigns in the Northern Caucasus against then revolting Lezgins. The assassination of Nader Shah sparked a brief period of civil war and turmoil, after which Karim Khan of the Zand dynasty came to power in 1750, bringing a period of relative peace and prosperity.