1. The Chola dynasty saw significant expansion under its powerful kings.
2. Rajaraja I (reigned 985–1014 CE) was a formidable Chola king who expanded the empire significantly.
3. One of his major military achievements was the invasion and conquest of the northern part of Ceylon (modern Sri Lanka) around 993 CE. He annexed this region to the Chola empire.
4. His son, Rajendra I, later completed the conquest of the entire island.
5. Aditya I and Vijayalaya were earlier Chola rulers involved in establishing and consolidating the kingdom's power, but the conquest of Ceylon is primarily attributed to Rajaraja I initially.