decorated with 16th- and 17th-century İznik tiles of variegated design. The central dome and the vaults of the rectangular bays have been painted. The decoration inside the dome and vaults are typical of the so-called Tulip period, which lasted from 1703 to 1730. The books were stored in cupboards built into the walls. The niche opposite the entrance was the private reading corner of the sultan. The library contained books on theology, Islamic law and similar works of scholarship in Ottoman Turkish, Arabic and Persian. The library collection consisted of more than 3,500 manuscripts. Some are fine examples of inlay work with nacre and ivory. Today these books are kept in the Mosque of the Ağas (Ağalar Camii), which is located to the west of the library. One of the most important items there is the Topkapi manuscript, a copy of the Qur'an from the time of the third Caliph Uthman Ibn Affan. "The New Library,” as it took to being called following the palace's museum designation, houses a unique collection containing more than 20,000 manuscripts - both Islamic and non-Islamic. The collection also boasts a wide array of valuable maps not found anywhere else in the world. The library contains several first edition copies of a variety of books, both Eastern and Western. The stunning collection of Islamic Miniatures exceeds 15,000. Additionally, the sultanate's private collection of 2,999 rare books is kept here as well. The rare and valuable collection also contains some of the world's finest examples of Islamic calligraphy. Over 3,000 Qurans written in Kufic script which date as far back as the eight century are kept in a special wing of the library called “The Rooms of the Sacred Trust.” The most precious books in the library are those hailing from the courts of the Ilkhanids - descendants of the Mongols - and their dynasties in 13th- and 14th-century Iran, and the exquisite books of the Timurid court in Herat of what is today Afghanistan. Persian manuscripts dating from the Safavi period - the 16th and 17th centuries - are also housed within the New Library and they are veritable works of art. Mosque of the Ağas The Mosque of the Ağas (Ağalar Camii) is the largest mosque in the palace. It is also one of the oldest constructions, dating from the 15th century during the reign of Mehmed II. The Sultan, the ağas and pages