The Christians of Iraq are considered to be one of the oldest continuous Christian communities in the world. The vast majority of Iraqi Christians are indigenous Eastern Aramaic-speaking ethnic Assyrians who are descent from ancient Assyria, and follow the Syriac Christian tradition. Some are also known by the name of their religious denomination as well as their ethnic identity, such as Chaldo-Assyrians, Chaldean Catholics or Syriacs (see Terms for Syriac Christians). Non-Assyrian Iraqi Christians are largely Arab Christians and Armenians, and a very small minority of Kurdish, Shabaks and Iraqi Turkmen Christians. Most present-day Iraqi Christians are ethnically, linguistically, historically and genetically distinct from Kurds, Arabs, Iranians, Turks and Turkmens (as well as from fellow Syriac Christians in Western Syria, Lebanon, Jordan and South Western Turkey). Regardless of religious affiliation (Assyrian Church of the East, Chaldean Catholic Church, Syriac Orthodox Church, Syriac Catholic Church, Assyrian Pentecostal Church, etc.) the Eastern Aramaic speaking Christians of Iraq and its surroundings are one genetically homogeneous people. They identify themselves as being a separate people, of different origins and with a distinct history of their own harking back to ancient Assyria and Mesopotamia (see Assyrian continuity and History of the Assyrians). Christian Assyrians also have communities in northeastern Syria, southeastern Turkey, and northwestern Iran as well as in the wider worldwide Assyrian diaspora.
Syriac Christianity was first established in Mesopotamia, and certain subsets of that tradition (namely the Church of the East and its successor churches) were established in northern and central-southern Iraq, and would eventually spread to becoming one of the most popular Christian churches in the Middle East and Fertile Crescent Region, and would spread as far as India and China.
Iraq plays a rich and vital contribution to Christian history, and after Israel, Iraq has the most biblical history of any other country in the world.