discription of dynasty

It is proved from the evidence mentioned in Maitryupanishad Prapathak 1 to 4 that from the beginning of creation till the Mahabharata period, only Chakravarti kings of Kshatriya dynasty have been there. Because in order to keep this earth pure, God himself had installed a king in the form of an Ashwattha tree named Ikshvaku of Kshatriya lineage for the first time in Satyayuga. That king had two branches, Suryavansh and Chandravansh. Through the tradition of serial progeny of these two dynasties, they have been ruling this earth for all four ages.