Mehmet Efendi, who lived between 1568 to 1615 was an Ottoman scholar and statesman. With the education that he had, he started his scholarship life as a teacher then he raised to the islamic leadership (şeyhülislam). His father Hodja Sa‘deddin Efendi was one of the famous scholars and statesmen. Mehmet Efendi wrote a supplement to Tâcü’tTevârih which belonged to his father. Hodja Sa‘deddin Efendi wanted to write about Sultan Süleyman period but he couldn’t write.. In Ibtihâcu’t-Tevârih it’s possible to find some informations about Ottoman history writing concerning with that period. This article examines Mehmet Efendi and his historianship.