Chola invasion of Kedah
The Tamil prasaśti of Virarajendra Chola records about a naval invasion of the early Ancient Kedah called "Kadaram" named by the medievals and ancient Tamils, and also the Cholas in 1068. Sources assert that the expedition was undertaken to help a Kadaram prince who had approached Virarajendra Chola for assistance in procuring the throne. The kingdom of Kadaram is believed to be the same as the Srivijaya empire although some scholars disagree.
Background
The reasons of this naval expedition are unclear, the historian Nilakanta Sastri suggested that the attack was probably caused by Srivijayan attempts to throw obstacles in the way of the Chola trade with the East, or more probably, a simple desire on the part of Rajendra to extend his digvijaya to the countries across the sea so well known to his subject at home, and therefore add luster to his crown. Another theory suggests that the reasons for the invasion was probably motivated by geopolitics and diplomatic relations. King Suryavarman I of the Khmer Empire requested aid from Rajendra Chola I of the Chola dynasty against Tambralinga kingdom. After learning of Suryavarman's alliance with Rajendra Chola, the Tambralinga kingdom requested aid from the Srivijaya king Sangrama Vijayatunggavarman.Invasion
Malaiyur in Malaysia, with "its strong mountain", has been identified with Malayu in today Jambi province in Batanghari river valley, where a strong principality flourished at that time. Other suggestion is the southern part of the Malay peninsula gets conquered by the cholas. Mayirudingam is believed to be the same as Ji-lo-ting listed by the Chinese writer Chau Ju-Kua among the dependencies of Sri Vijaya and is identified with the city of Chaiya in the centre of the Malay peninsula.The land of Ilangasoka mentioned in the inscriptions has been located on the east coast of the Malay Peninsula and is believed to be the same as the province of Ling-ya-sseu-kia mentioned in Chau Ju-Kua's list.Talaittakkolam is believed to be the same as Takkola mentioned by Ptolemy as a trading emporion on the Golden Chersonese, and identified with Trang or the modern-day city of Takuapa in the Isthmus of Kra. and at last Kadaram, All these cities weree conquered and subjugated by the Chola empire.