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500
One reason for the collapse
The Gupta Empire faced constant threats of invasion from the north. The cost of fighting off these invasions drained the Gupta treasury, and the government had difficulty refilling the coffers for the internal reasons noted above. Among the most troublesome of the invaders were the White Huns, who had conquered much of the northwestern section of Gupta territory by 500 CE. -
550
Second reason for Collapse
Although none of the invading groups managed to completely overrun the Gupta Empire, the financial hardship helped hasten the end of the dynasty. Almost unbelievably, the Huns or their direct ancestors the Xiongnu had the same effect on two of the other great classical civilizations in earlier centuries: Han China, which collapsed in 221 CE, and the Roman Empire, which fell in 476 CE.