170px|Chedi Phrae Boromadhatu According to the inscription no.24 found at Hua-wieng temple in Chaiya near to Nakhon Si Thammarat, the ruler of Tambralinga named Chandrabhanu Sridhamaraja was the king of Patama vamsa (lotus dynasty). He began to reign in 1230, he had the Phrae Boromadhatu (chedi in Nakhon Si Thammaraj, from Sanskrit dhatu - element, component, or relic + garbha - storehouse or repository) reparation and celebration in the same year. Chandrabhanu Sridhamaraja brought Tambralinga reached the pinnacle of its power in the mid-thirteenth century. From the Sri Lankan and Tamil materials, this Chandrabhanu was a Savakan king from Tambralinga who had invaded Sri Lanka in 1247. His navy launched an assault on the southern part of the island but was defeated by the Sri Lankan king. In at least two senses, the rapid expansion of Tambralinga is exceptional in the history of Southeast Asia. In the first place, Candrabhanu’s invasion of Sri Lanka and occupation of the Jaffna kingdom marks the only time that a Southeast Asian power has launched an overseas military expedition beyond the immediate Southeast Asian region. In the second place, in the historiography of Southeast Asia the southern Thailand has generally played a secondary role to that of places like Java  , the Malacca Strait region (Srivijaya in the seventh~eighth century, Melaka in the fifteenth century), Cambodia, Champa, Vietnam, and Burma. Tambralinga’s sudden appearance on centre-stage in the thirteenth century was thus highly unusual.
170px|Chedi Phrae Boromadhatu According to the inscription no.24 found at Hua-wieng temple in Chaiya near to Nakhon Si Thammarat, the ruler of Tambralinga named Chandrabhanu Sridhamaraja was the king of Patama vamsa (lotus dynasty). He began to reign in 1230, he had the Phrae Boromadhatu (chedi in Nakhon Si Thammaraj, from Sanskrit dhatu - element, component, or relic + garbha - storehouse or repository) reparation and celebration in the same year. Chandrabhanu Sridhamaraja brought Tambralinga to the pinnacle of its power in the mid-thirteenth century. From the Sri Lankan and Tamil materials, records and sources, Chandrabhanu was a Savakan king from Tambralinga who had invaded Sri Lanka in 1247. His navy launched an assault on the southern part of the island but was defeated by the Sri Lankan king. In at least two senses, the rapid expansion of Tambralinga is exceptional in the history of Southeast Asia. In the first place, Candrabhanu’s invasion of Sri Lanka and occupation of the Jaffna kingdom marks the only time that a Southeast Asian power has launched an overseas military expedition beyond the immediate Southeast Asian region. In the second place, in the historiography of Southeast Asia , southern Thailand has generally played a secondary role to that of places like Java , Sumatra , the Malacca Strait region (Srivijaya in the seventh~eighth century, Melaka in the fifteenth century), Cambodia, Champa, Vietnam, and Burma. Tambralinga’s sudden appearance on centre-stage in the thirteenth century was thus highly unusual.
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