Customary Law

What this is

This is the constitutional memory of Lanna: how the muang governed itself, written down. The catalogue files all 134 witnesses cleanly as Law, and the titles name a tradition with a clear two-layer structure.

At its foundation sits the dhammasattha (Lanna Thammasat) — the Mon-Burmese root-of-law treatise that gives the northern codes their frame: Thammasat luang, Thammasat lae calit papeni, Thammasat lacasat (the dhammasattha paired with the rājasattha, the king's law). On top of it rests the Mangraisat — the code attributed to King Mangrai, founder of the Lanna kingdom, which recurs here under every spelling: Kotmai phanya manglai, Manglaisat, Nangsue manglai, the Tamnan phanya manglai. And running through both is a recurring ideological figure — the two wheels, āṇācakra and dhammacakra, royal authority and religious law "made equal" (anacak lae thammacak tiam kan). Law in Lanna was never purely secular: its very titles insist that the king's wheel and the dhamma's wheel turn together.

A nice conceptual key sits in the recurring Lokawinai / Wohan lokawinai — "worldly vinaya": law understood as the layperson's discipline, the secular counterpart to the monastic code. And at the edges the corpus shades into recorded custom proper — Kotmai lae phapeni (law and tradition, prapheni) — which is why it is customary law.

The shape of the collection

Its physical profile is fully canonical: 93% palm-leaf, an all-but-total 99% Tham Lanna, entirely Pali-and-Lan Na. The dated witnesses run from the late 18th to the late 20th century, clustering in the 19th. But the striking pattern is geographic — see below.

Notes

• Perfectly even geography — and it means something. Phrae, Phayao, Nan and Lampang each hold almost exactly a sixth of this genre; no library dominates, and Wat Sung Men's usual gravity is absent. Law was copied to every muang because every muang had to be governed by it. Better still, the codes were localised: Kotmai mueang Nan — Nan's own ordinances — shows the tradition adapting to each polity. The local recensions are the most historically valuable objects here, and the genre's even spread is a genuine regional sample rather than a survival artifact.
• Two layers worth separating. The imported dhammasattha root-of-law and the local Mangraisat royal code are different kinds of text bound under one "Law" label; pulling them apart, and pulling out the customary prapheni material, is the obvious next pass.
• Law is inseparable from religion here. The anacak / thammacak pairing is not decoration — it is the genre's governing idea, and it is telling that one witness was raw-labelled "General Buddhism." Read this corpus beside the chronicles, where the same Tamnan Phanya Mangrai supplies the polity's historical charter, and beside the didactic literature, where conduct and custom overlap.