The MahaparinibbanaSutta is the account of the events of the last year of the Buddha's life.
The Sutta is one of the most detailed consecutive accounts of the events of any single year in the Buddha's life to be found in the Buddhist Canon.
According to the Sutta, Mara the Evil One approached the Buddha and made a request, saying that as by that time the Buddha's disciples had become well trained and proficient in the dhamma, and as the religious system had been well established, it was time for the Buddha to pass away and realize Parinibbana.
The MahaparinibbanaSutta, from the Long Discourse of Pali Tipitaka, is without doubt the most reliable source for details on the death of Siddhattha Gotama (BCE 563-483), the Lord Buddha.
In the MahaparinibbanaSutta, we are told that the Buddha became ill suddenly after he ate a special delicacy, Sukaramaddava, literally translated as "soft pork", which had been prepared by his generous host, Cunda Kammaraputta.
When the sutta was composed, its author was under the impression that the Buddha died, not because of the food he ate, but because he already had an underlying illness that was serious and acute-and had the same symptoms of the disease that finally killed him.