FIRST Tirthankara and Lord Mahavira was the last Tirthankara.Mahavira wandered for twelve years to attain perfect knowledge and later he was known as Jina(CONQUEROR) and the followers of Mahavira were called Jains.In Jainism, there are three jewels- right belief, right knowledge, and right action to achieve salvation.Jain monks FOLLOWED non-violence very strictly and they opposed the caste system.Jainism declined due to its strict RULES of non-violence.The farmers found it difficult to maintain because they need to kill weeds and insects in order to produce their crops. hence their HARVEST was termed as sin.