Nagarjuna was the founder of Madhyamaka.According to Mahamegha-sutra, Nagarjuna was born in about B.C.26, 460 years from the nirvana of Buddha.He died in about A.D.100, because as to the story of accient India, he had to commit suicide by the threat of the son of Gautamiputra, soon after, Gautamiputra died too, so his son became the king, instead of him, this event took place in about A.D.106, so Nagarjuna's tragedy came out not long before this year.Another reason, the student of Aryadeva, Matrceta, had writen a letter to Kaniska I, said that he was too old to visit the King, and the king was very young, Kaniska I was a great governor, he ruled the north India from A.D.105 to 132 about, as Aryadeva's student became an old man at the early days of Kaniska I, so Nagarjuna could only leave the world before.