The Tibetan Book of the Dead, whose actual title is "The Great Liberation upon Hearing in the Intermediate State" or "Bardo Thodol", is traditionally believed to be the work of the legendary Padma Sambhava in the 8th century A.D. The book acts as a guide for the dead during the state that intervenes death and the next rebirth. He is considered to be one of the first persons to bring Buddhism to Tibet. The Bardo Thodol is a guide that is read aloud to the dead while they are in the state between death and reincarnation in order for them to recognize the nature of their mind and attain liberation from the cycle of rebirth.
See original: 
The Tibetan Book of the Dead
