The Chaldean Christian community was less numerous and vociferous at the time of the British Mandate of Mesopotamia, and did not play a major role in the British rule of the country. However, with the exodus of Assyrian Church of the East members, the Chaldean Catholic Church became the largest non-Muslim religious denomination in Iraq, and some Assyrian Catholics later rose to power in the Ba'ath Party government, the most prominent being Deputy Prime Minister Tariq Aziz. The Assyrians of Dohuk boast one of the largest churches in the region named the Mar Marsi Cathedral, and is the center of an Eparchy. Tens of thousands of Yazidi and Assyrian Christian refugees live in the city as well due to the ISIS invasion of Iraq in 2014 and the subsequent Fall of Mosul