sentences:  Armenian hypothesis
  
  The Armenian hypothesis of the Proto-Indo-European homeland, proposed by Georgian Tamaz V. Gamkrelidze and Russian linguist Vyacheslav Ivanov in the early 1980s, suggests that Proto-Indo-European was spoken during the 5th–4th millennia BC in "eastern Anatolia, the southern Caucasus, and northern Mesopotamia".Recent DNA-research has led to renewed suggestions of a Caucasian homeland for a 'pre-proto-Indo-European'.