organisations of merchants called "nagaram" in big centres of trade like Kanchipuram and Mamallapuram. Hospitals Hospitals were maintained by the Chola kings, whose government gave lands for that purpose. The Tirumukkudal inscription shows that a hospital was named after Vira Chola. Many diseases were cured by the doctors of the hospital, which was under the control of a chief physician who was paid annually 80 Kalams of paddy, 8 Kasus and a grant of land. Apart from the doctors, other remunerated staff included a nurse, barber (who performed minor operations) and a waterman. The Chola queen Kundavai also established a hospital at Tanjavur and gave land for the perpetual maintenance of it. Society During the Chola period several guilds, communities and castes emerged. The guild was one of the most significant institutions of south India and merchants organised themselves into guilds. The best known of these were the Manigramam and Ayyavole guilds though other guilds such as Anjuvannam and Valanjiyar were also in existence. The farmers occupied one of the highest positions in society. These were the Vellalar community who formed the nobility or the landed aristocracy of the country and who were economically a powerful group. The Vellalar community was the dominant secular aristocratic caste under the Chola rulers, providing the courtiers, most of the army officers, the lower ranks of the bureaucracy and the upper layer of the peasantry. The Vellalar were also sent to northern Sri Lanka by the Chola rulers as settlers. The Ulavar community were working in the field which was associated with agriculture and the peasants were known as Kalamar. The Kaikolar community were weavers and merchants but they also maintained armies. During the Chola period they had predominant trading and military roles. During the reign of the Imperial Chola rulers (10th–13th century) there were major changes in the temple administration and land ownership. There was more involvement of non-Brahmin elements in the temple administration. This can be attributed to the shift in money power. Skilled classes like the weavers and the merchant-class had become prosperous. Land ownership was no longer a privilege of the Brahmins (priest caste) and the Vellalar land owners. There is little information on the size and the density of the population during the Chola reign The stability in the core Chola region enabled the people to lead a productive and contented life. However, there were reports of widespread famine