<P> Despite these seemingly negative effects, the Treta Yuga also brought knowledge of universal magnetism . This knowledge allowed humans to understand the forces of nature and the true nature of the universe . Agriculture and mining came into existence along with norms and rules to keep society under control . </P> <P> Vishnu incarnated as the Brahman Parashurama in this era because there were too many warlike Kshatriyas plaguing the Earth, and he therefore had to wipe out most of the world's warriors . However, some of the Kshatriyas survived or more were created, and their population grew again . Eventually, the avatara of Vishnu in Parashurama ended, though it is said that he continued to live on as a mighty warrior - hermit . He confronted Rama angrily years later, before acknowledging the latter's supremacy and retiring . He lived on in the Dvapara Yuga, having a great duel with Bhishma for the sake of Amba . However he failed to defeat him and stopped fighting after he was forbidden by the divine sage Narada and his ancestors and learning that Bhishma had surpassed him in art of warfare . He mentored Dronacharya, teacher of both the Kauravas and Pandavas . Parashurama also taught Karna how to use the Brahmastra but when he found out that Karna had lied about being a brahmana, he cursed Karna that his knowledge of the Brahmastra would fail him when he needed it the most . He is said to be still alive today, doing penance on the Mahendragiri mountain . </P> <P> The hallmark of this era was the rise of evil in the form of the demon king of Sri Lanka, Ravana . He conquered the three worlds namely, Earth, Heaven and the Netherworld (Patala) and terrorized everyone . Even the Devas were subordinate to him - his son Meghanada had earned the title Indrajit by defeating Indra, the King of heaven in battle; and even the Sun had to obey the king . In this scenario, Lord Vishnu incarnated himself as the son of King Dasharatha of the Suryavamshis or Ikshvaku dynasty and was named Rama . Due to a stepmother's jealousy, Rama was sent away to a forest in exile for 14 years, during which time he confronted and killed Ravana for kidnapping his wife, and thus stored peace on earth . He is said to have afterwards established Rama - rajya or Rama's Kingdom over the entire earth from his throne at Ayodhya for 11,000 years, before eventually returning to his Mahavishnu form . </P>

Who was born first lord rama and krishna