Political Instability in Iran at 14th Century: Statistical Examination of the lifespan of Governments and Average Time of Monarchies

14th century is the century of establishment of local dynasties. In this century, various dynasties proliferated throughout Iran, hence, there was not a central and integrate government. In this research, lifespan of governments and average time of monarchies examined by Cliometrica as one of the components of instability. As a result, there is a correlation between lifespan of governments and monarchies with creation of unstable conditions. Average lives of five monarchies in these centuries are 51 years that is a low number. Among these five monarchies, no Dynasties has lived for over a hundred years, three ones had less than 50 years age. Average of monarchies was under 10 years. Dynasties in these two centuries had a short age of stability and there was one stable monarch. Some dynasties like Sarbedaran, Injuids and Chupanids did not have stability and they entered into decline period after establishment. Many Internal conflict in these monarchies caused that majority of monarchs had not opportunity to create stable and long term government.