including Juha Janhunen, Roger Blench and Matthew Spriggs, suggest that modern-day Mongolia is the homeland of the early Turkic language. Relying on Proto-Turkic lexical items about the climate, topography, flora, fauna, people's modes of subsistence, Turkologist Peter Benjamin Golden locates the Proto-Turkic Urheimat in the southern, taiga-steppe zone of the Sayan-Altay region. Extensive contact took place between Proto-Turks and Proto-Mongols approximately during the first millennium BC; the shared cultural tradition between the two Eurasian nomadic groups is called the "Turco-Mongol" tradition. The two groups shared a similar religion system, Tengrism, and there exists a multitude of evident loanwords between Turkic languages and Mongolic languages. Although the loans were bidirectional, today Turkic loanwords constitute the largest foreign component in Mongolian vocabulary. Some lexical and extensive typological similarities between Turkic and the nearby Tungusic and Mongolic families, as well as the Korean and Japonic families has in more recent years been instead attributed to prehistoric contact amongst the group, sometimes referred to as the Northeast Asian sprachbund. A more recent (circa first millennium BC) contact between "core Altaic" (Turkic, Mongolic, and Tungusic) is distinguished from this, due to the existence of definitive common words that appear to have been mostly borrowed from Turkic into Mongolic, and later from Mongolic into Tungusic, as Turkic borrowings into Mongolic significantly outnumber Mongolic borrowings into Turkic, and Turkic and Tungusic do not share any words that do not also exist in Mongolic. Turkic languages also show some Chinese loanwords that point to early contact during the time of Proto-Turkic. Robbeets (et al. 2015 and et al. 2017) suggest that the homeland of the Turkic languages was somewhere in Manchuria, close to the Mongolic, Tungusic and Koreanic homeland (including the ancestor of Japonic), and that these languages share a common "Transeurasian" origin. More evidence for the proposed ancestral "Transeurasian" origin was presented by Nelson et al. 2020 and Li et al. 2020. Early written records The first established records of the Turkic languages are the eighth century AD Orkhon inscriptions by the Göktürks, recording the Old Turkic language, which were discovered in 1889 in the Orkhon Valley in Mongolia. The Compendium of the Turkic Dialects (Divânü Lügati't-Türk), written during the 11th century AD by Kaşgarlı Mahmud of the Kara-Khanid Khanate, constitutes an early linguistic treatment of the family. The Compendium is the first comprehensive dictionary of the Turkic languages and also includes the first known map of