Re-visiting the denominations of Shia's beliefs in the concept as Mahdi - from the beginning to the end of the Small Absence Period (in early times) with an emphasis on the survival of the Imam

This research seeks to present a perspective on Shiite trends that tend to have a particular conceptualization of savior (Mahdi). Originated in the course of the earlier Presence, a time when the formation of various coherent and non-coherent sects was followed, many of them believed in a special edition to the belief in Mahdiism. They also provided a special concept of Mahdi, but they did not last long, most of which disappeared at the time and could not have a long life. Meanwhile, other enduring Shiite sects such as Zaidi and Ismailis, who believed in a specific case of Mehdi, reconsidered their views, and they believed in specific ideas in the realm of Imamate, among which only Imamieh (Twelvers) have become the mainstream who not only kept their interest in the idea of savior, but also came to formulate a specific conceptualization of Mahdaviyyat that stood the test of time and remained in history.