The golden age of this church was the period from the fourth to the thirteenth century. They had twenty-five flourishing colleges. The most important schools were located at Oddessa, Nesibis, and Urhai. The latter was called the queen of schools. These schools, while they flourished, were the secret of the churches' strength. The instructors were the most learned men of their age. Aiwaz and St. Basil of Nesibis and Urhai were among the most learned teachers. The Assyrian, Arabic and Greek languages were taught classically. Medicine, astronomy, and mathematics including geometry were taught. Especial attention was given to the study of theology. There were as many as 2,000 monks and students in some of these institutions. Their doctors of medicine were given high positions under the Arabian and Persian governments. Literature in the eastern languages was rich. From these schools came great church fathers who defended the church from the heretics of the age. There is one MSS 900 years old in the library of the Presbyterian Mission which is called "Persecuted Simon." It was written by Simon, a student in one of these colleges. It contains twelve lectures all against the heretics of his age. During that period about 700 such MSS were written. There are to-day in Europe many MSS written by these scholars that are from 300 to 1500 years old. The New Testament was translated into the Assyrian language in the middle of the second century. These MSS are skillfully executed and show the beauty and antiquity of this church. Only three of these ancient MSS are now to be found in Persia, but there are many of them scattered in the libraries of Europe. CHAPTER VI. ASSYRIAN MISSIONARY SPIRIT.