on the Web-Site of Phillip Lindsay you find :
Hidden History of Humanity – Rootraces & Cycles
http://esotericastrologer.org/hidden-history-humanity/
this knowledge was buried for centuries . Who did bury it ?
https://vivavortex.wordpress.com/2017/10/04/die-fuenf-zeitalter/ german language
take your time to read and view this information, the hidden history