End of the Classical period
This period ends with the destructive invasions of the Alchon Huns in the 6th century CE. During the rule of the Hunnic king Mihirakula, over a thousand Buddhist monasteries throughout Gandhara are said to have been destroyed. The Chinese pilgrim Xuanzang, writing in 630 CE, explained that Mihirakula ordered the destruction of Buddhism and the expulsion of monks. He reported that Buddhism had drastically declined, and that most of the monasteries were deserted and left in ruins.
Although only spanning a few decades, the invasions had long-term effects on India, and in a sense brought an end to Classical India. Soon after the invasions, the Gupta Empire, already weakened by these invasions and the rise of local rulers, ended as well. Following the invasions, northern India was left in disarray, with numerous smaller Indian powers emerging after the crumbling of the Guptas