The geography of Türkiye has been home to many different cultures throughout its ancient history. In this process, Anatolian lands, which harbor different ethnic and religious groups, have had a rich cultural heritage. Igdir and Kars, the two frontier cities of the Eastern Anatolia Region, are among the most remarkable examples of this cultural mosaic. The tolerant attitudes of people with different ethnic and religious identities residing in these two regions towards each other are very important in terms of contributing to social peace and tranquility. The Islamic world, which did not witness many different religious and political discourses until the death of the Prophet Muhammad, experienced great ruptures and divisions after his death with the discussions on who would be the caliph. These disagreements, which started during the first three caliphs and increased day by day, were at their most intense during the caliphate of Ali. This grouping, which started as the Ali and Muʿāwiya faction, led to the emergence of two major groups in the Islamic world as a result of the debate over who belonged to the caliphate. One of them is Ahl alSunnah, which claims that the caliphate of the rashid caliphs is their right in the order of their caliphate and that there is no nass (written law) other than this and adopts the jurisprudence of the Companions and their followers, and the other is Shia, which claims that the caliphate is the right of Ali and his descendants Ahl al-Bayt. Today, Shia, which is the second largest sect in the Islamic world in terms of geography and followers, is divided into many sub-groups. The largest of these groups is the Jafariyya sect, also called Imāmiyya and It̲h̲nā ʿAs̲h̲ariyya. A large number of people belonging to the Jafari sect live in our country, especially in the provinces of Igdir and Kars. The majority of these are Azerbaijani Turks. Regardless of religion, language, race and gender, there are important periods in the human life. These milestones, also called phases of life or transitional periods, have brought along a number of rituals. The birth event, which is accepted as the beginning of life, is the first one of these periods. There are many beliefs and practices that start from the gestation period and cover the process until the birth of the baby and afterwards in order to ensure that his/her future life will be healthier, comfortable, peaceful and successful. This process is even divided into periods as before and after birth. Another transition period is marriage, which is the beginning of a person's union with the person with whom s/he will carry out his/her life, establish his/her own home and continue his/her offspring. For young people who think that it is time to get married, there are issues to be sensitive about how to choose a spouse and what to pay attention to and what to do in order to ensure a happy union between the spouses after the marriage. Of particular importance are the prevailing beliefs and consequent practices that if these are not observed, the spouses and their families, and even the children born from this marriage, will be unhappy and restless. Death, which is accepted as the end of world life, is the last of the transitional periods. Starting with things that are considered to be signs of death, such as bad dreams, severe illnesses, certain natural phenomena, there are certain duties that fall on the relatives of the deceased at the moment of death and afterwards. These duties are accepted as a means of ensuring that the deceased's life in the grave is better, as a kind of atonement for the sins committed while alive, and as a kind of indicator of the social status of the funeral owners and whether they have fulfilled their last duties towards the deceased. The transitional phases that begin with birth and end with death and the practices that emerge as a result of the beliefs regarding them are indispensable elements of social life, although they are not based on any written source or official sanction. The people belonging to the Jafariyya sect, which is perhaps the first thing that comes to mind when it comes to Shia, one of the largest schools of Islam, are present in our country as well as in the world. Although there is no clear figure for their number, it is estimated that they have a considerable population in Türkiye as it is in the Islamic world. The provinces of Igdir and Kars, which are among the distinguished settlement centers of the Eastern Anatolia Region, are among the places where they live intensively. In this study, which we have prepared by focusing on these two provinces, we will try to express what kind of beliefs our citizens who belong to the Jafari sect have about the events of birth, marriage and death, which we call the transition periods of life, before and after, and what kind of practices they perform as a result of these, based on the data we have obtained as a result of the literature review and fieldwork we have done. With this study, which we have conducted based on the principle of objectivity, which is one of the basic elements of the history of religions, we aim to contribute to the better recognition of the Ja’faris, who are an important part of the cultural mosaic of our country, through their beliefs and practices regarding the transition periods, and to reveal their similarities with other ethnic and belief groups in the same geography.