Presents biographies of HRH Prince Chainat Narenthorn, following letters, the prince when he attended to royal duties and foreign affairs. Traces details of his family background and personal life to Thai modern medicine and public health development in Thailand. Mentions his life through the changing of Thai society related to social classes, rebel, and war from historical records. Highlights personal trips to Europe by narrating life at sea, port cities, traditional cities found inland, and popular culture in port-cities. [TAIC]