Attested by texts dating to 500-1000 AD that were found in early 20th century in Chinese Turkestan
Anatolian (extinct)
Unknown until the 20th century when it was discovered during excavations in Turkey. Texts written in cuneiform date to 13th-7th centuries BC.
In addition to these main groups, there are fragmentary records of other Indo-European languages. These records, mostly in the form of inscriptions, do not provide sufficient material for the reconstruction of PIE.