Enderūn School, which had an important place in the Ottoman education system, was established with the aim of training qualified civil and military personels for the state. This institution consisted of rooms or wards where gradual education was provided, and those with superior qualities among the devshirmes were taken here and subjected to special training. In Enderūn, the education started in Great and Small Chambers (Büyük and Küçük Oda) and ended in the Private Chamber (Hās Oda) at the highest level after the education they received in the palaces of Edirne, Galata, İbrahim Pasha and İskender Çelebi, which was a kind of preparatory school. In the first two rooms of the education, which continued in seven stages, basic courses were given in addition to Turkish, Arabic and Persian without specialisation. Those who successfully completed these stages were given the opportunity to develop their individual skills by providing theoretical lessons in the other rooms and the opportunity to practice due to their obligation to fulfil the work of the room they were in. Inner boys (İç oğlanlar), who also received art education according to their talents, were also trained in various sports branches. Those who completed the training period in each room were promoted to the next level as they were deemed successful, thus endeavouring to bring the best ones to a level to serve the state. Since the Qurʾān al-Karīms and books in the library of the Cellar Room (Kiler Odası), which is one of the rooms here, are the subject of the article, brief information about this room is given and the works, most of which are manuscripts, are introduced, and the other rooms are excluded from the study. The members of the Cellar Room, which is in the fifth rank of the Enderūn School from bottom to top, were assigned to meet all kinds of food and beverage needs of the sultan and the harem under the direction of the cellar master (kilercibaşı) called serkilārīi hāṣṣa, and serving food to the sultan was also given to this ward. The charge of supplying candles for the palace rooms and masjids and the preparation of the tarpaulins used in injuries were included among the duty of the room’s members. In addition to these duties, the inner boys received theoretical education and completed courses that were similar to the education given in madrasas, and tried to be successful by reading books on religious sciences, ethics, grammar, literature and history. Information about the books in the ward was found in a register (defter) belonging to the Topkapı Palace Museum Archive in the Presidency of the Republic of Turkey Directorate of State Archives Ottoman Archive, and these data, which provide information about the theoretical education here, are tried to be explained within the scope of the article. The aforementioned register was kept due to a waqf established by Süleyman Agha, the cellar’s chamberlain (Kiler Kethüdası) of the period, in Evāsıt-ı Muharrem 1154/29 March-7 April 1741, in order to ensure the protection of the Qurʾān al-Karīms and some of the books in the library of the room after some of them were lost, and the books in the library were recorded with all their characteristics. The register, which was prepared with the aim of determining the current situation at the time of the waqf’s establishment and to control the books in the following process based on these records, was first written Muṣḥafs from large to small according to their size, then Qurʾān al-Karīm chapters, Enʿāms and prayer books, then tafsir, hadith, fiqh, jurisprudence, al-ʿakāʾid, Sufism and logic books, works on Arabic grammar and other books on various subjects. The types of calligraphy, the number of lines on the pages and the illumination features of the Qurʾān al-Karīms of these manuscripts, most of which are in the category of rare works, are recorded separately, and if they were endowed, it is especially stated by whom they were donated. The books that had previously been in the library but had been lost were also noted, and efforts were made to preserve the books through the protector of the books (ḥāfiẓ-i kütüb), who was employed by the waqf established to prevent further losses. The data in the register enable to the writing of this article, which aims to know the manuscript and illuminated Qurʾān al-Karīms and books on various subjects, most of which are manuscripts, which are believed to have been found in other rooms of the Enderūn School, and thus to learn which works were taught to the inner boys during their education. The data in the register enabled to the writing of this article, so it is aimed to know the manuscript and illuminated Qurʾān al-Karīms and books on various subjects, most of which are manuscripts, which are believed to have been found in other rooms of the Enderūn School, and thus to learn which works were taught to the inner boys during their education. [ABSTRACT FROM AUTHOR]