In 781 AD the East Syriac Catholicos, Timothy I, was invited by the Abbassid Caliph al-Mahdi to answer a series of questions about Christianity over two days. The discussion took place at Baghdad, while the Caliph’s son, Harun al-Raschid, was conducting a campaign against the Byzantines.
The questions and his replies are extant in Syriac. I’ve placed the English translation by Alphonse Mingana online here:
Timothy I was an interesting man, heavily involved in the Nestorian evangelism which ultimately reached China. He also was involved in biblical textual criticism, and his letters record the discovery of some old manuscripts of the Psalms in the region of the Dead Sea; a possible precursor of the modern Dead Sea Scrolls discovery.
The text above is public domain: please copy freely. It now forms part of my collection of public domain patristic texts available here:
For those who would like to support the work of the site, you can buy a CDROM of the translations from here:
All the best,