According to B. B. Lal, former DG of ASI, Kalibangan site shows that an earthquake occured around 2600 BC, which brought to an end the Early Indus settlement at the site. It is perhaps the earliest archaeologically recorded earthquake.
Kanishka was the third ruler of the Kushana empire. He was the grandson of Kadphises I, the founder of the Kushana empire. The famous Rabatak Inscription written on a rock in the Bactrian language and the Greek script presents valuable information on Kanishka.
Priyadarsika is a Sanskrit play attributed to king Harshavardhan. It was first translated into English by G. K. Nariman, A. V. Williams Jackson, and Charles J. Ogden in 1923. Ratnavali and Nagananda are other works of Harshavardhan. Harshavardhan was also a great lover of education and learning. Emperor Harshvardhana wrote all the three plays in the Sanskrit Language.