Al-Taftazani

Sa'ad al-Din Masud ibn Umar ibn Abd Allah al-Taftazani () also known as Al-Taftazani and Taftazani (1322–1390) was a Muslim Persian polymath. 
Early life and education.
Al-Taftazani was born in 1322 in Taftazan, Khorasan in Iran, then in the Sarbedaran state. However as recorded by Ibn Khaldun Al-Taftazani was native to Herat, Khorasan in current-day Afghanistan. He completed his education in various educational institutions in the cities of Herat, Ghijduvan, Feryumed, Gulistan, Khwarizm, Samarkand and Sarakhs. He mainly resided in Sarakhs. He was active during the reign of Timur, who noticed him as a promising scientist and supported his scholarship, and was part of his court. Ibn Hajar al-Asqalani famously remarked about him that "science ended with him in the East" and "no one could ever replace him". He died in Samarkand in 1390 and was buried in Sarakhs. He practiced and preached in the Hanafi and Ashari schools. He was of the Hanafi school in matters of Fiqh (Islamic jurisprudence) and an Ashari with regard to issues of Aqidah (Islamic creed).
Career.
During his lifetime, he wrote treaties on grammar, rhetoric, theology, logic, law and Quran exegesis. His works were used as textbooks for centuries in Ottoman madrasahs. and are used in Shia madrasahs to this day. He completed "Sharh-i az-Zanjani" which was his first and one of his most famous works at the age of 16. He also wrote a commentary of the Qur'an in Persian and translated a volume of Sa'adi's poetry from Persian into Turkish. But it was in Arabic that he composed the bulk of his writing.
His treatises, even the commentaries, are "standard books" for students of Islamic theology and his papers have been called a "compendium of the various views regarding the great doctrines of Islam".
Legacy.
Ibn Khaldun said of him: 
I found in Egypt numerous works on the intellectual sciences composed by the well-known person Sa'd al-Din al-Taftazani, a native of Herat, one of the villages of Khurasan. Some of them are on kalam (speculative theology) and the foundations of "fiqh" and rhetoric, which show that he had a profound knowledge of these sciences. Their contents demonstrate that he was well versed in the philosophical sciences and far advanced in the rest of the sciences which deal with Reason.