Gita Mahatmya of the Padma Purana and Srimad Bhagavata Mahatmya of Skanda Purana

In the Mahabharata we can trace out the history of the Gita as follows in the beginning of the millennium known as Treta yuga this science of the relationship with the Supreme was delivered by Vivasvan to Manu. Manu being the father of mankind give it to his son Maharaja Iksvaku the king of this earth planet and forefather of the Raghu dynasty in which Lord Ramachandra appeared. Therefore Bhagavad Gita existed in human society from the time of Maharaja Iksvaku. At the present moment we have just passed through five thousand years of the Kali yuga which lasts 432,000 years.