Universal soul is one of the main Keystone of the philosophy and the thought of the Upanishad. Brahma satyam Jagat Mitya Jeevo Bramanah Parah talks about the impermenance of the body and its existence.
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.
Pandyas acknowledged the overlordship of the Cholas for about 30 years. Prantaka Viranayana was also defeated by Krishna III who was the Rashtrakuta King, in the battle of Takkolam in 949 A.D.