Trypillian build in Nebelivka (Ukraine) settlement which reached 15,000–18,000 inhabitants. (jan 1, 4050 BC – jan 1, 4000 BC)
Description:
https://en.wikipedia.org/wiki/Cucuteni%E2%80%93Trypillia_cultureThomas K. Harper. "The effect of climatic variability on population dynamics of the Cucuteni-Tripolye cultural complex and the rise of the Western Tripolye giant-settlements" (PDF). Chronikajournal.com. Retrieved 14 November 2016.
Müller, Johannes; Rassmann, Knut; Videiko, Mykhailo (22 January 2016). Trypillia Mega-Sites and European Prehistory: 4100–3400 BCE. p. 347. ISBN 978-1317247913. Retrieved 14 November 2016.
Added to timeline:
Date:
jan 1, 4050 BC
jan 1, 4000 BC
~ 50 years