Tamnan is the northern Thai chronicle: history told as sacred etiology. A tamnan explains how something holy came to be here — how a relic reached a hill, how an image was cast, how the Buddha's teaching arrived in a particular muang, how a lineage or a polity began. It is the vaṃsa literature of Lanna, cousin to the Sinhalese chronicle tradition, and its titles in this collection are exactly that: Samaeng that to Suthep (the chronicle of the relic of Doi Suthep), the Anāgatavaṃsa (the chronicle of the future Buddha, Metteyya), a run of …watthu origin-legends, and the "sixteen muang" (sip hok moeng) polity-chronicles.
Read the raw labels before assuming "chronicle" means dynastic annals. The catalogue splits this genre as Buddhist Chronicle (54%) and Tamnan (31%) against only 15% "Secular History." This is overwhelmingly the religious chronicle — history in the service of a relic, an image or the sāsana — rather than the courtly annal (phongsāwadān) the word "chronicle" might suggest. That religious weight shows in the language too: the Pali content runs heavy here, because a vaṃsa is written in, or construed against, the canonical tongue.
For this archive this genre is the connective tissue. Tamnan are not wichaa, but they are where the sacred landscape is documented and legitimised — the relics, images, lineages and places that the living amulet-and-relic culture still draws its authority from. A chronicle is often the earliest paperwork a holy object has.
At 1,060 witnesses this is a large genre, and — unusually — a genuinely pan-Lanna one. Where the canonical corpus is really one Phrae library, the chronicle spreads evenly: Phrae (24%) and Chiang Mai (23%) stand almost level, with Phayao and Lampang close behind. That Chiang Mai — the old capital — figures so strongly is telling; so is the appearance of Wat Chiang Man (the first royal temple of the city) and Wat Si Khom Kham (Phayao) among the top holdings alongside the ever-present Wat Sung Men. The place-counts here carry real regional signal, not just the shadow of a single collection.
Its physical support is canonical — palm-leaf (93%), Tham Lanna (94%) — the chronicle copied for permanence like the scripture it accompanies, not as a working paper.