The existence of this kingdom was first mentioned in Thanjavur inscription written in Tamil dated from 1025 and 1030. The inscription created by Rajendra Chola I, king of Cholamandala kingdom, Chola Dynasty, in South India, mentioned about Chola invasion of Srivijaya. This inscription mentioned Pannai with its water ponds was among the conquered cities during Rajendra Chola I campaign against Srivijaya.