Decline of the Kushan Empire

Timeline

1. 200–240Bactria · Central AsiaKushan royal succession was frequent, the empire split into several local regimes, central control over outlying provinces weakened, and both finances and military strength showed a declining trend.
2. 240–270Khorasan–Bactria frontier · West AsiaSasanian Persia's Shapur I campaigned eastward; the Kushans lost Bactria and other western Central Asian territories, the empire's western barrier collapsed, and Silk Road trade routes came under the control of rising powers.
3. 270–300Northwestern India · IndiaThe Gupta Empire rose from Magadha and expanded northwestward; the Kushans lost large territories in the Indus Valley, and by the end of the third century the Kushan Empire existed in name only as a unified state, its territory divided among successor regimes.