Kulathunga gave a new turning point to the Chola history. Literary sources like Kulothunga cholan pillai Tamil, Vikrama Cholan Ula speak about his administration and military conquests. He controlled the Pandya and Chera kings. He fought with the western chalukya king Vikramadithya. During the reign of Kulothunga, the Chola Empire was very extensive. He took back the Vengi throne from Vijayaditya. Kulothunga-I was known to Far Eastern countries like China and Sumatra. He sent an embassy to the Chinese court. Later he lost his control over the northern part of Ceylon. He had control over the southern part of Ceylon. He controlled Kalinga. He introduced reforms to improve the economic conditions of Chola Kingdom. He carried out a systematic land survey.