Mor Ignatius Nemet Allah I (also Ignatius Ni‘matallah, latinized as Nehemias) was the Syriac Patriarch of Antioch from 1557 to 1576. A learned mathematician

Mathematician

A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....

 and astronomer

Astronomer

An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...

, he is mostly known for his work on Pope Gregory XIII's commission on the reform of the calendar. Because of this involvement, he was forced to abdicate by Islamic extremists and had to escape to Rome. He is most likely to have joined the Roman Catholic Church and have died shortly after that in 1587.

Education

While he was young, he went to Za'faran Monastery and became a monk there. He studied church sciences and Syriac literature and was ordained priest.

Commission of Calendar Reform

Mor Ignatius Nemet Allah I was one of the nine scholars that helped Gregory XIII to reform the Gregorian Calendar.