Conversation so far:
Who ruled over the Assyrian homeland in the Middle Ages?
Following the Arab Islamic conquest of Mesopotamia in the 7th century Assyrian Christians throughout the Middle Ages were subjected to Arabizing superstrate influence.
Who did the Rashidun Caliphate have to defeat to rule over Mesopotamia?
Arab Muslims first attacked Sassanid Empire territory in 633.
Who else ruled Mesopotamia during the Middle Ages besides the Rashidun Caliphate?
Its Christian inhabitants were little affected by the Ottoman conquests
Are there any other interesting aspects about this article on Assyrian homelands besides the goverenance during the Middle Ages?
The areas that form the Assyrian homeland are parts of present-day northern Iraq, southeastern Turkey, northwestern Iran and, more recently, northeastern Syria.

Question: what is Beth Nuhadra ?
Self-contained rewrite: What is Beth Nuhadra?