The Statistical Typology of Seljuk King’s Illness ؛the Analytical Study of the Relationship of Death Type and Continuity and Length of Kingship (431-590 A.H).

In 431 AH, after a 13-year struggle with the Ghaznavids, the Seljuk Turkic dynasty succeeded in defeating them decisively in the battle of Dandanqan and laying the foundation of a government that lasted until 590 AH. During the 159 years of Seljuk rule in Iran, 15 members of this dynasty officially came to power. Most of the rulers of this dynasty died as a result of various diseases. Some of them were killed during internal conflicts in order to gain power or in the process of confronting the foreign enemies of the monarchy. With a few exceptions, the deaths of both groups, and especially of the sultans who died an unnatural death, occurred at a young age. This caused most of the rulers of this dynasty to have an unstable monarchy. In the present study, an attempt has been made to study the manner of death of the Seljuk sultans and the relationship between the type of death of these rulers and their reign and life.

In the present study, using statistical methods, the most important sources of the Seljuk era have been studied and analyzed in order to achieve the objectives of the research.

Most kings who died a natural death had a history of various diseases; but they died as a result of a certain disease. The most important of these diseases were colic, hemorrhoids, tuberculosis, inflammatory fever, smallpox, diarrhea and sexually transmitted diseases. The group that died of abnormal deaths also sometimes had a history of certain diseases; however, before they died of the disease, they were killed by their opponents and rivals. The lifespan of those rulers who died a natural death was longer than the second group.

In the process of conducting this research, while observing the principle of fidelity in the use of resources, non-scientific and biased analyzes have been refused.

Out of 15 Seljuk sultans, 10 died due to various diseases. Colic with three cases, tuberculosis and fever with two cases each and other diseases with one case, caused the death of this group of kings. The average age of this group is 38 years and their average reign is 15.3 years. Although two of the other five Seljuk sultans had a previous illness, all five were killed abnormally by their opponents. Three of them were poisoned by the claimants to power, and two others were killed by swords in battle with foreign opponents of the monarchy. The average age of this group was 36 years and their average reign was 9.03 years.