The main purposes of this thesis were to study (1) the leadership in Buddhism, (2) Phrarajadhammasophon’s role on leadership, and analytically, (3) six aspects of Phrarajadhammasophon’s leadership role on development of the Buddhist Order in the Roi-et province. This study was a qualitative research with the field interview in order to make the research work complete and more successful. The following points were found in this research study.

            A leader or administrator who had knowledge and capacity to encourage the other people to attain purposes and get satisfied was called ‘leadership’. The leadership was not mentioned directly in Buddhism. The leader in Buddhism had many internal and external qualities: vision, skills, courtesy, faithfulness, believable manners, dignified look, and following the Buddhist principles: threefold supremacy—understanding a system of proper administration of organizations and communities, four divine states of mind—wise use of authority and encouragement, four objects of sympathy—creation of friendliness with the other people, and fivefold power—wise self control and stability of intelligent and motivation. The other Buddhist teachings for the leadership were six states of conciliation—understanding the self control with the administration, six directions—a study of the social role and responsibility, seven conditions of welfare—qualitative management that stressed on the organization’s benefits, and seven qualities of a good man—self control and careful management of organizations with the protection of danger in the future. The administrative had to be free from three hindrances of developing the leadership: roots of evil—thoughts against goodness, self-reliance—the use of the absolute dictation for management, and four ways of prejudice—improper behavior for the leadership. There were many modern theories of the leadership. However, the reformative theory of the leadership was more excellent than the other theories because there was the integration of many theories that could make a leader to support the organizations and have the cooperation with the others in many aspects. If there was the integration of these two theories of the leadership, the most benefits would arise in the organizations and societies.

             Phrarajadhammasophon’s role dealt with following general teachings to support his good leadership: threefold supremacy and four divine states of mind for his administration, four objects of sympathy for welfare education, public welfare, fivefold power for Buddhist education and propagation, six states of conciliation for management to create equality within the organization, six directions for the management of Buddhist education and propagation to make good relation between a controller and controlled persons, seven conditions of welfare for the management to make the ecclesiastical management of men and work easier and possible, and finally, seven qualities of a good man for the integration of knowledge, ability, and intelligence to support the professional management of the organizations.

            Moreover, a researcher found that Phrarajadhammasophon had the good leadership and could develop the ecclesiastical organizations of the Buddhist Order in the Roi-et province was found in various aspects. Generally, Phrarajadhammasophon’s leadership covered three aspects: material, mind and societies. The first aspect dealt with helping many Buddhist monasteries that he had controlled. The second aspect dealt with the moral, ethical instruction for all people by organizing a project of moral training, giving a sermon, describing the Buddhist teachings, giving the sheets of the Buddhist teachings, and recorded materials of given sermons. The third aspect organized a meeting of ecclesiastical and lay works that caused good co-operation among people around the monasteries. He had finished works through getting faithful from his controlled persons and other Buddhists. Some factor that supported his leadership people was high education and high ecclesiastical position, an Ecclesiastical Governor of Roi-et province.