Explanations:
The founder of Chola dynasty was Vijayalaya (around 850 CE). Rajaraja I was the greatest ruler of this dynasty. He constructed Rajarajeshwara or Brihadesvara temple in Tanjore. His son Rajendra-I led an expedition to the north & crossed the river Ganga. He assumed the title of Gangaikondachola (Victor of Ganges).