The Buddha passed away peacefully at Kushinagar, formerly known as Kusinara in the Malla Kingdom, India, at 80 in 543 BC, or about 2,564 years ago, in the presence of hundreds of his disciples, including the Ven. Ananda.
A few moments before His Mahaparinibbana, or Great Passing-Away, He left His Last Message, which has been known since then as the main pillar of the Buddhist faith: Be your Own Saviour.
An excellent video by Dare to Do about the Buddha’s last message: Be Your Own Saviour.