Question

what helped the Chola ruler Raj Raj I to stablished control over several Island territory​

Answer 1

Explanation:

Rajaraja Chola I

In 925, his son Parantaka I conquered Sri Lanka (known as Ilangai). Parantaka I also defeated the Rashtrakuta dynasty under Krishna II in the battle of Vallala. Rajaraja Chola I and Rajendra Chola I were the greatest rulers of the Chola dynasty, extending it beyond the traditional limits of a Tamil kingdom.

Answer 2

Answer:

Well equiped and armed navy helped cholas take control of coasts.