The thammasat (ธรรมศาสตร์; Pali dhammasattha) is the cosmic law-treatise — the frame that tells a Southeast Asian legal world where law comes from and why it binds. In the tradition's own telling, the dhammasattha is not made by kings but discovered: a primordial sage reads the eternal law written at the boundary-wall of the universe and brings it back for humankind. It is the _kadi tham_ pole of law — the dhamma-law — that stands above and legitimates the king's positive code, the Mangraisat.
Twenty witnesses carry a thammasat / dhammasat name, classed as customary law. Set beside the twenty-four Mangraisat witnesses, the catalogue holds both poles of the Thai legal cosmos in near-equal number — a genuinely valuable pairing.
Inference — that the two clusters are of comparable size is itself a finding: this collection preserves the whole legal architecture, not just its enforceable half. The thammasat supplies the theory (law as discovered cosmic order); the Mangraisat supplies the practice (a named king's enforceable code). Having both in one corpus is what lets the archive show law as the tradition itself understood it — a single structure with a heavenly frame and an earthly body.
Tradition — the following is background from the wider Thai–Burmese–Mon legal tradition, not established from these specific manuscripts; treat as orienting, not authoritative.