From Empire of the Winds: The Global Role of Asia’s Great Archipelago, by Philip Bowring (I.B. Tauris, 2018), Kindle pp. 126-127:
For centuries Nusantaria’s seafaring skills and island geography protected it from outsiders. But in 1025, those walls were breached by another trading state, this one from across the Bay of Bengal. The Tamil Chola dynasty attacked and sacked Palembang, seized Kedah and for several decades had a permanent presence on the peninsula. The attacks on Srivijaya by the Cholas were the only known direct military engagement of an Indian state in Nusantaria. They changed trading dynamics and seriously weakened Srivijaya.
By contrast, their cultural impact may have been slight because Indian-derived culture was so embedded in the region that the Chola military intervention barely added to it. Chola interaction with the region pre-dated the attack as Nusantarian trade and cultural relations with south India had long been close. For example, its architectural influence can be seen in Java’s Prambanan temple, built 70 years before the attack. As late as 1016 the Chola King Rajendra donated funds for the upkeep of a shrine in Nagapattinam erected by the Srivijayans. This referred to the Sailendra family as the kings of Srivijaya and Kedah.
These relations between Chola and Srivijaya were further enhanced by the trade boom of the Tang era which saw the rise of the Chola kingdom to control the whole of southern India. A professional army and bureaucracy brought strong government which undertook public works such as damming the Kaveri River and created an environment in which the arts and literature flourished. From its base at Nagapattinam on the Kaveri delta, it expanded its land borders to the west coast and eventually sent its forces north as far as Bengal. The Cholas did not have a permanent navy, but had at their disposal merchant ships able to transport armies complete with elephants. This naval power enabled it to conquer Sri Lanka and the Maldives and become the dominant force in eastern Indian Ocean trade. Before taking on Srivijaya they had had much practice in a war against the Sinhalese: Sri Lanka saw half a century of Tamil rule of most of the island and the establishment of Shivaite temples.
The Cholas were Hindu with a predominantly Shivaist alignment, though Buddhist shrines continued to be patronized. The main driver of rivalry with Srivijaya was commerce, not belief. The Chola kingdom was strongly influenced by its merchant guilds who, emboldened by conquests elsewhere and seeing Srivijaya being challenged by east Java, wanted to reduce the Srivijayan grip on trade and be noticed by China as an important country. Arab sources record how the Srivijayan king controlled the whole of the [Malay] peninsula but the Cholas wanted to capture some of this trade for themselves and not be dependent on Srivijayan cooperation. Indicating their ambitions, they sent an embassy to China for the first time in 1015.
This was a time when trade was expanding again after a pause caused by the declines of the Tang dynasty in China and the Abbasid one in the Muslim world. Now the Song were in control of China and the North African-based Fatimids were the biggest power in the Muslim world. Already by 985 an Arab was writing: ‘Baghdad was once a magnificent city but is now fast falling into ruin […] Al-Fustat of Misr [Cairo] in the present day is like the Baghdad of old.’
War may have started well before the 1025 Chola sacking of Palembang and capture of the king.
Far Outliers 