Hoca Sadeddin (or Sa'düddin) Efendi (Ottoman Turkish: خواجه سعد الدین افندی‎ 1536 or 1537 – October 2, 1599[1]) was an Ottoman scholar, official, and historian, a teacher of Ottoman sultan Murad 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".[1]