The traditions of act wrought in the first three centuries of the hijri and the fundamental issues contained in these trails

Treatises of Akaid are important classics written on the principles of belief in Islamic sciences. Theses, which determine the line of defense against various beliefs and currents of ideas, are processed in the creeds of creed. It is seen in the works attributed to the early period authors in the various strata books and in the Index of Ibn al-Nedim that the Akaid treatises were not only for defense against foreign beliefs, but were copyrighted with the aim of revealing the belief principles of Islam. These treatises, especially written in the first three centuries, have a very important place in the formation of Islamic thought. In the thesis titled "Aqîde Treatises Written in the First Three Centuries of Hijri and the Basic Issues Addressed in These Treatises", various texts that were written about faith but did not reach today were identified and mentioned. Afterwards, the epistles written in the first three centuries of Hijri were identified and classified according to the types of copyright/classification and sectarian formation. The subjects covered in the treatises written in the first three centuries of the Hijra, the refutations written against superstitious beliefs and sects, Kitâbü'l-İmân, Kitâbü's-Sunna type works, Kitâbü't-Tevhîd, Fiqh-ı Ekber Treatises, Mu'tazilî, Murciî, Shiite, Kharicî treatises on creed, hadith, tafsir and mysticism literature were examined within the framework of the chapters opened to creed. First of all, the life of the author of the identified treatises was briefly mentioned, then the place of the work in its own period and the thematic evaluation of the issues it dealt with were made. In the second part, theological issues discussed in the mentioned texts are explained. The issues are discussed from the perspective of today, under the titles of divinity, prophethood, sem'iyyat, human actions, imamate and belief. In particular, the enlargement of the framework in the treatises according to the periods and its background are the cornerstones of our study. Keywords: The first three centuries of Hijri, creed, treatise, literature, tafsir, hadith, mysticism, theology, prophecy, sem'iyyat, human actions, faith, imamate