AD 618

Songtsen Gampo

Traditional accession of Songtsen Gampo amid a succession crisis

The young successor inherited not only his father’s throne but a revolt by people who had obeyed both sides of his family.

A traditional year, and a rival one

Tibetan tradition places Songtsen Gampo’s accession after the death — reportedly by poisoning — of his father, Namri Songtsen. The year cannot be securely fixed, and 618 is traditional rather than documented.

Matthew Kapstein gives the reign approximately as 617 to 649/650, while the Treasury of Lives places the accession in 629: an eleven-year difference.

The Old Tibetan Annals’ continuous yearly record begins only near the end of Songtsen Gampo’s life, and the Old Tibetan Chronicle is a later composite with acknowledged chronological problems.

A revolt at the accession

Groups formerly subject to both his father and his mother — including the Sumpa of eastern Tibet — opposed the new ruler and rebelled.

The rebellion was put down, which allowed Songtsen Gampo to retain the tsenpo’s authority over the emerging Central Tibetan state.

Namri Songtsen had already subordinated neighbouring polities, so this was the survival of an inherited position rather than the creation of a state from nothing.

What did not happen that year

The immediate change was dynastic succession and the survival of the new regime — not the simultaneous creation of Lhasa, the Tibetan script, Buddhism and an empire-wide legal code.

Princess Wencheng, his Chinese consort, arrived in Tibet in 641, decades after the traditionally dated accession.

“First emperor” is retrospective shorthand: his title was tsenpo, which an Old Tibetan–Chinese glossary treated as comparable to “Son of Heaven”.

Sources

Researched 24 Aug 2026 6 sources not yet audited Date disputed

How this was checked

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Date disputed. Sources disagree; the research places it at ~0618.

What the sources leave uncertain

The year 618 is traditional, not securely documented. Matthew Kapstein gives the reign approximately as 617–649/650, while the Treasury of Lives places the accession in 629.
The Old Tibetan Annals’ continuous yearly record begins only near the end of Songtsen Gampo’s life, while the Old Tibetan Chronicle is a later composite using earlier material and has acknowledged chronological problems.
The claim that he was thirteen derives from later royal tradition. It depends on accepting both an uncertain birth year and an uncertain accession year.
“Thirty-third king of the Yarlung dynasty” is traditional numbering. Helga Uebach notes that “Yarlung dynasty” is a modern convenience and no contemporary Tibetan dynastic name is known.