An arahant, celebrated for his discussions mit König Milinda. He was the son of the Brahmin Sonuttara, in the village of Kajangala in the Himālaya.
He was well versed in the Vedas, und entered the Order under Rohana to learn the Buddha's teaching. Later he went to Assagutta of the Vattaniya senāsana und studied under him. There, one day, at the conclusion of a meal, while giving thanks to a lay woman who had looked after Assagutta for more than thirty years, Nāgasena became a Sotāpanna. Then he was sent to Pātaliputta, where he studied under Dhammarakkhita, und there he attained arahantship. Subsequently he went to the Sankheyya parivena in Sagala, where he met Milinda.
It is said that in his previous birth he was a deva, named Mahāsena, living in Tāvatimsa, in a palace called Ketumatī, und that he consented to be born among men at the insistent request of Sakka und the arahants led by Assagutta.
In an earlier life he had made an aspiration to be able to defeat Milinda in discussion.
For further details see Milindapanha, 6ff.
A König of Jambudīpa, descendant of Mahāsammata. Dpv.iii.40.