The mountainous region of the Assyrian homeland, Barwari, which was part of the diocese of Beth Nuhadra (current day Dohuk), saw a mass migration of Nestorians after the fall of Baghdad in 1258 and Timurlane's invasion from central Iraq.[18] Its Christian inhabitants were little affected by the Ottoman conquests, however starting from the 19th century Kurdish Emirs sought to expand their territories at their expense.