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.
First Rajgir, Second vaishali, Third patliputraFourth Buddhist Council is the name of two separate Buddhist council meetings first in Sri Lanka and another at Sarvastivada school, in Kashmir around the First Century AD.