Question

who were the cholas?explain rajaraja and rajendta cholas?

Answer 1

The Chola dynasty was one of the longest-ruling dynasties in the history of southern India. The earliest datable references to this Tamil dynasty are in inscriptions from the 3rd century BCE left by Ashoka, of the Maurya Empire.
Raja Raja Chola I was a renowned king who ruled over the Chola kingdom of southern India between 985 and 1014 CE. 
Rajendra Chola I or Rajendra I was a Chola emperor who is considered one of the greatest rulers and military generals of India. He succeeded his father Rajaraja Chola I in 1014 CE.

Answer 2

Chola established a powerful empire in South India . Cholas ruled in South India for nearly four centuries.

Rajaraja chola defeated the pandyas and the cheras . he built a strong navy to control trade along the coastal areas.

Rajendra chola was Rajaraja chola's son he succeeded his father to the throne . rajendra chola made the empire even more powerful .
After he defeated palas he called himself Gangaikondachola.