Hoca Sadeddin (or Sa'düddin) Efendi (1536 or 1537 – October 2, 1599) was an Ottoman scholar, official, and historian, a teacher of Ottoman sultanMurad III (when Murad was prince). His name is transcribed differently: Sa'd ad-Din, Sa'd al-Din, Sa’adeddin, Sadeddin, etc. He was also called "Hoca Efendi", "Koca Hoca Efendi" and with the title of "Câmi'-ür Riyâseteyn".
When Murad became Sultan, Sadeddin became his advisor. Later he fell out of favor, but was appointed Sheikh ul-islam, a superior authority in the issues of Islam.
Sadeddin is the author of Tâc üt-Tevârîh (Tadj ut-Tewarikh, “Crown of Histories”), a history of the Ottoman Empire in prose and verse.
Hoca Sadeddin Efendi, Tâcü't-tevârih. Sad. İsmet Parmaksızoğlu, vols. 1-5, Kültür Bakanlığı, Ankara, 1974-1979 reprint:1999. ("Sad". means Sadelestiren, "simplification")
Vol. 1: Osman Gazi, Orhan Gazi, Hüdevendigar Gazi ve Yıldırım Han Devirleri.
Vol. 2: Yıldırım Han'dan Fatih Sultan Mehmed'e.
Vol. 3: Fatih Sultan Mehmed ve İkinci Beyazid Dönemi.
Vol. 4: Şehzadelerin Girişimleri - Selimname ve Yavuz Sultan Selim Dönemi.
Vol. 5: Hatime. Orijinal karton kapaklarında.
Saad ed-dini scriptoris turcici Annales turcici usque ad Muradem I cum textu turcico impressi. Translated to Latin, edited and annotated by Adam F. Kollár. Vienna: 1755.
Bulgarian translation: Калицин, Мария. Корона на историите на Ходжа Садеддин. Transl. of Vol. 1. from Osman Turkish; analysis and commentary. Велико Търново (Veliko Tarnovo), Publ. "Абагар" ("Abagar"), 2000, 437 с, ISBN954-427-427-8