Yaman Dede (1887–1962) Yaman Dede, whose name was given to the mosque, was born in Talas in 1887 and is a child of a Christian family of Karaman Turks. Known as “Yaman Dede, Yanar Dede, Yamandi Molla, Molla Bey” nicknames, the real name was Diamandi. His father is textile trader Yuvan Effendi, her mother Afurani Hanım. Some documents found in the Niğde Bor Library say he learned that the Greek Orthodox Mosque in which he belonged was originally Turkish. When he was young, his family moved to Kastamonu. He studied here in Greek Orthodox School, later in Kastamonu High School. In these years, non–Muslim children entered lessons such as Arabic and Persian with the permission of their teachers, even though they were not obliged to attend religious lessons.

In 1909 he entered Istanbul Darülfünün Law School. He graduated in 1913. Until 1932, he served as a member of the Beyoğlu I. Court of Justice. At the same time he attended Ahmed Celaleddin Dede and Ahmed Remiz Dede (Akyürek) Mesnevi lessons in Galata Mevlevihânesi. Ahmed Remzi Dede named himself “Yaman Dede” by appreciating his work and effort. In this period he says he adopted the life of the Muslims, talking about the Mevlânâ, the shaykhs and imams came to visit him and he continued reading the hymns beside the religious conversations. On the other hand, he was a member of Mason Lodge and rose to the 13th rank. It expresses that it is removed because of the closeness to Islam.

Yaman Dede, in his letters says that he adopted Islam from his youth, but he was afraid to express it clearly because of family reasons, that he continued to read Islamic works secretly, went to the church with his family but did not read the prayer and fasted for forty years without knowing his family sometimes without iftar. In February 1942, with the encouragement of Naqshbandi–Khalidî Sheik Ahmed Hilmi Effendi, he officially announced that he accepted Islam and Mehmed Abdulkadir took Keçeoğlu's name.

Yaman Dede, after accepting Islam, is separated from his spouse by the pressure of the patriarch who is uncomfortable with his will. This situation has upset him, especially in his letters to his longing for her daughter Belma. After a while he marries a primary school teacher named Hatice. He was a lawyer, after he had taught in some schools, he left his lawyership and turned to teaching. He gave lectures in Saint Benoit, Notre Dame, Istanbul Higher Islamic Institute in Turkish, Literature, Persian and Arabic. He died on May 3, 1962 and is in Karacaahmet Cemetery.