Assyrians are an indigenous ethnic group native to Assyria, a geographical region in West Asia. Modern Assyrians descend from their ancient counterparts, originating from the ancient indigenous Mesopotamians of Akkad and Sumer, who first developed the civilisation in northern Mesopotamia (modern-day Iraq) that would become Assyria in 2600 BCE. Modern Assyrians may culturally self-identify as Syriacs, Chaldeans, or Arameans for religious, geographic, and tribal identification.
Assyrians speak Akkadian-influenced Aramaic (Suret, Turoyo), one of the oldest continuously spoken and written languages and one of the oldest alphabetically written languages in the world. Aramaic has influenced Hebrew, Arabic, and some parts of Mongolian and Uighur. Aramaic was the lingua franca of West Asia and the language spoken by Jesus Christ.
Assyrians are almost exclusively Christian, with most adhering to the East and West Syriac liturgical rites of Christianity. The churches that constitute the East Syriac rite include the Chaldean Catholic Church, Assyrian Church of the East, and the Ancient Church of the East, whereas the churches of the West Syriac rite are the Syriac Orthodox Church and the Syriac Catholic Church. Both rites use Classical Syriac as their liturgical language.
The ancestral indigenous lands that form the Assyrian homeland are those of ancient Mesopotamia and the Zab rivers, a region currently divided between modern-day Iraq, southeastern Turkey, northwestern Iran, and northeastern Syria. A majority of modern Assyrians have migrated to other regions of the world, including North America, the Levant, Australia, Europe, Russia and the Caucasus. Emigration was triggered by genocidal events such as the massacres in Hakkari, the massacres of Diyarbekır, the Assyrian genocide (concurrent with the Armenian and Greek genocides) during World War I by the Ottoman Empire and allied Kurdish tribes, the Simele massacre, the Iranian Revolution, Arab Nationalist Ba'athist policies in Iraq (between the years 1968–2003) and in Syria the take over by Islamic State of many parts in Syria and Iraq, particularly the Nineveh Plains between 2014–2017.