Philip Jenkins wrote about the Assyrian Christians recently in The Christian Century:
The Assyrian Christians of northern Iraq are among the people who have been massacred and kidnapped by ISIS militants in recent months. Such accounts are depressingly familiar to anyone who knows the region’s history. In fact, this year marks a grim centennial. Besides being the centennial of the Armenian Genocide, it’s the centennial of the year that the Ottoman Turkish regime struck at other Christian minorities whom it suspected of being sympathetic to Russia. The Assyrians call 1915 Sayfo, the Year of the Sword.
Assyrian Christians had very deep roots in the region, and their churches use a Semitic language related to Jesus’ own Aramaic. In late antiquity, believers divided over the Person of Christ. The Monophysite branch evolved to become the modern-day Syrian Orthodox Church. Their Nestorian rivals formed the Church of the East, which remained a flourishing transcontinental institution through the Middle Ages.
UPDATE (5/26/15): Jenkins also wrote at Aleteia that the slaughter of Assyrian Christians by Iraqi soldiers and civilian raiders in 1933 (see here and here for more detail) played a secondary role in the thought of Raphael Lemkin about genocide (the Armenian genocide played the primary role). Lemkin invented this word and called for the crime to be punishable by international authorities:
That paradox continued to trouble him until, in 1933, new massacres of Assyrian Christians in Iraq forced him to define his ideas still further. Using the case of the Assyrians, and of the Armenians before them, he argued for a new legal category to be called crimes of barbarity, primarily “acts of extermination directed against the ethnic, religious or social collectivities whatever the motive (political, religious, etc).” Such crimes, he argued, should be an offense against international law that demanded to be punished by a special court or tribunal.
In 1943, Lemkin coined a new word for this atrocious behavior—namely, “genocide.” For many years, he was the most vigorous and visible campaigner to secure global recognition for the new concept, and finally, in 1948, the United Nations adopted the Convention on the Prevention and Punishment of the Crime of Genocide. However familiar the notion of genocide might be today, it originated at a specific (and quite recent) historical moment, and was largely formulated by one man, who must be remembered as one of the greatest humanitarian thinkers of the twentieth century.