Second in importance are the Assyrians, those Nestorians who did not unite with Rome. The British settled about 20000 of them in the northern areas of Iraq around Zakhu and Dahuk following the First World War. The Assyrians, so called because they claim descent from the ancient Assyrians, proved to be one of the most unsettling elements in Iraq's modern history prior to the Second World War. Their uninvited intrusion into the country through the intervention of a foreign power was deeply resented by the Muslims and especially by the Kurds, in whose areas they were settled. In recent years the Assyrians have become more integrated.