Gül Baba (real name Cafer) was a Bektashi dervish and Sufi poet from Merzifon (Amasya), called 'Father of Roses' because he always carried a rose in his turban. He joined Ottoman campaigns from Mehmed II to Suleiman the Magnificent and was martyred in 1541 during the conquest of Buda; Evliya Çelebi records that a vast gathering attended his funeral prayer. His octagonal, lead-domed tomb was built on Rózsadomb (Rose Hill) by Yahyapaşazade Mehmed Pasha between 1543 and 1548. It is regarded as the northernmost Islamic pilgrimage site in the world. (Sources: TDV İslam Ansiklopedisi 'Gülbaba'; Wikipedia 'Tomb of Gül Baba')