Ibrahim Ummi Sinan, pir of the Sinaniyye branch of the Halvetiyye order, a leading Sufi and poet of 16th-century Istanbul. He died in 1568 and was buried in the tomb of the Ummi Sinan Lodge in Düğmeciler, Eyüp. (Sources: TDV 'Ümmî Sinan Tekkesi'; 'Sinâniyye'.)