The Mangraisat (มังรายศาสตร์, "the law of Mangrai") is Lanna's own law-book — the body of customary and royal law ascribed to King Mangrai, founder of Chiang Mai (1296) and of the Lanna kingdom. It is the northern Thai world's home-grown legal tradition: rules for land, debt, marriage, theft, injury and inheritance, framed as the settled custom of the müang rather than as imported scripture. Where the thammasat supplies the cosmic frame of law, the Mangraisat supplies the positive, enforceable code of a specific kingdom.
Twenty-four witnesses carry a Mangrai-law name, all classed as customary law. This is one of the archive's more solid clusters — a genuine, multi-copy legal tradition attested directly in the manuscripts, not merely inferred.
Inference — twenty-four copies is a meaningful survival for a regional law-book, and it signals that the Mangraisat was actively recopied and used, not a single antiquarian relic. A cluster this size is worth a variant study: customary codes drift as they are copied from temple to temple and court to court, so these witnesses very likely disagree in their particulars — exactly the material a content-level comparison could map.
Tradition — the following is background from the wider Thai–Lanna tradition, not established from these specific manuscripts; treat as orienting, not authoritative.