Rome was not built in a day. Likewise, Chola Dynasty didn't meet its end by a battle or on a day but by a chain of unfortunate events.

In short, Cholas were first defeated by Pandyas in 1217, they were somehow restored back to power. After the first defeat, the Chola Dynasty faced a continuous decline till 1279, which marked the end of Chola dynasty. The last king of the dynasty was Rajendra Chola III and was defeated by Pandya King Maravarman Kulasekara Pandyan I.

Delhi Sultanate
After the death of Muhammad of Ghor, Aibak declared independence and established the Delhi Sultanate in AD 1206.

The Delhi Sultanate lasted for a period of320 years from AD 1206 to 1526.

This period of three hundred twenty years was shared by the Mamluks or slaves, Khiljis, Tughlaks, Sayyads and Lodis, of the Mamluk dynasty, the most important rulers are Iltutmish and Balban, while Alauddin Khilji was the most important; of the Tughlak line the most important are Muhammad bin Tughlak and Ferozshah Tughlak and of the Lodis the important one is Ibrahim Lodi. Timur invaded India and destroyed Delhi during this period towards the end of 15th century.