A Khalwatī shaykh born in Tokat who guided disciples in the Bursa and Bolu–Düzce region, and was the master of Şaʿbān-ı Velī, founder of the Khalwatiyya-Şaʿbāniyya. His date of death is not fixed in the sources (c. 1525-1530). The tomb attributed to him is in Elmalık village, 13 km from Bolu. NOTE: the “Tokatlı Hayreddin Efendi” buried in Bursa is a DIFFERENT person; TDV notes the two namesakes are often confused.