What is "akshamsaddin"

Akshamsaddin (Muhammad Shams al-Din bin Hamzah, ) (b. 1389, Damascus - d. 16 February 1459, Göynük, Bolu) , was an influential Ottoman religious scholar, poet, mystic saint, and guide of Mehmed the Conqueror. After completing his work with his master Shaykh Haji Bayram Wali, he found the Shamsiyya- Bayramiyya Sufi order. He is the founder of the lost grave of the companion, host, and esteemed standard-bearer of Prophet Muhammad, Abu Ayyub al-Ansari, in Constantinople.