The Vessantara — the Mahāchat, "the Great Birth" — is the last and greatest of the jātaka: the story of the prince whose perfection of giving is so total that he gives away his children and his wife. In Lanna it is not merely a text but the text of communal Buddhism, recited in full at the Thet Mahachat festival, and the catalogue holds 85 witnesses whose titles name it. What makes it worth an article of its own is that a single story appears here in four different guises at once — and each guise belongs to a different genre.
The genre spread tells the story: 76 of the 85 sit under jātaka, but the remainder scatter into Buddhist canonical (4), magic & ritual (3), poetry and liturgy — and the titles make the four modes plain:
The same title is a birth-story on one shelf, a recitation cue on another, a merit-manual on a third and a folk-song on a fourth. Vessantara is the clearest worked example in the collection of how a single work refuses to stay inside one genre.
Physically it is canonical — 94% palm-leaf (80 of 85), 99% Tham Lanna — and old, with dated witnesses running 1646–1951 and 69 of the 85 carrying a date. But its geography breaks the usual scholastic pattern: it does not cluster at Wat Sung Men the way plain jātaka does. Lampang leads (42), ahead of Phrae (25) — the Vessantara was copied wherever the Thet Mahachat was performed, which is to say nearly everywhere, rather than concentrated in one great library.