Tajeddin Sultan (Tajeddinzade Mustafa Efendi) was a 17th-century sheikh of the Celveti (Jelveti) Sufi order linked to Aziz Mahmud Hudayi. He founded a dervish lodge in Ankara's Hamamonu district. His tomb is among the most visited shrines in Ankara after that of Haci Bayram-i Veli. His exact death date is unknown. (Sources: TDV Islamic Encyclopedia, 'Taceddin Dergahi'; Turkey Tourism Encyclopedia.)