Zsuzsanna Csorba and István Lánczky spent a week in Istanbul from June 12-19, 2017. They aimed to examine and obtain sources for their doctoral dissertations and other research areas. Their research was mainly conducted in the Süleymaniye Yazma Eser Kütüphanesi. The library and its collection, which can be found in the Süleymaniye Mosque, is composed of approximately 100,000 manuscripts in Arabic, Turkish and Persian languages as well as about 50,000 printed books in Turkish and various European languages prior to when writing was reformed. In addition to studying the manuscripts and reference works of the Süleymaniye Library, our researchers also had the opportunity to visit smaller libraries in Istanbul and visit the İnebey Yazma Eser Kütüphanesi in Bursa.