What led to the decline of the Gupta Empire?

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. It grew weak from a number of secession disputes. As the emperors lost power regional lords gained increasing autonomy. In a sprawling empire with weak leadership, it was easy for a rebellion in Gujarat or Bengal to break out, and difficult for the Gupta emperors to put such uprisings down.