In June 1915 it gained territory from the suppressed Chaldean Catholic Diocese of Seert (now a titular see).

On 3 January 1966, it was promoted to an Archeparchy (Eastern Catholic archdiocese) and a new archbishop was ordained to fill the role.

Its episcopal see was historically located at St. Mary's Cathedral in Diyarbekir, and it still is in modern day.

[1] Statistics 1980 6,000 1990 1,400 1999 5,000 2001 5,100 2002 5,100 2003 4,800 2004 5,925 2006 4,226 2009 6,219 2013 7,640 (incomplete) The Archeparch (archbishop) is immediately subject to the Patriarch of Babylon, who heads the Chaldean Catholic Church.

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