The northernmost of the three prefectures Champa ceded to Ly Thanh Tong in 1069, with Địa Lý and Ma Linh behind it.
Vietnamese settlers were brought in and the ground was surveyed in 1075, but it is thinly held, it changes hands with the fortunes of the two courts, and in a weak reign like this one it is a march rather than a province (board). We draw the whole stretch from the Ngang pass to the Thạch Hãn as a Ly claim backed by settlers and posts, not as ground that is plainly administered or plainly lost. The Cham plain of Chau O and Chau Ly begins south of it.
The seat's site is not fixed; the campaign board's point is the district of Bố Trạch.
Who holds it
- Title
- Ly frontier governor of Bố Chính (not named)
- Confidence
- low
The campaign board entry notes; English Wikipedia (Ly dynasty on the cession of 1069)
Lord in 1200
A Ly frontier governor; not named.
What the town holds
- Rice and fishing villages of the narrow Quảng Bình strip
- The Gianh river mouth and the road to the Mụ Giạ pass
- A claim to Địa Lý and Ma Linh to the south
How things stand that morning
A march held by a Ly claim, settlers and posts; the Cham claim to take it back is old and not dated to the 1190s. We found no source for a battle here in 1198 to 1200.
Wealth
Poor strip of rice and fish; the road is worth more than the land.
Military
Garrison posts and settlers; no numbers.
Threats
- A Cham push north (not dated)
- Khmer or Cham raids by sea
- The Lao tracks over the range
Council
The frontier governor and the settlers' headmen; not recorded.
Communities
Viet settlers placed from 1069; Cham villagers who stayed (not documented for 1200); Bru-speaking hill folk inland (the later Bru and Vân Kiều).
Militia
Garrison and settler levies; no numbers.
Walls and castle
Posts and stockades; no wall or citadel known.
Trade and crafts
Fish, salt, rice; the Mụ Giạ track to the Lao side.
What the year holds
What happened next, if nothing in play changes it. Each event carries what it depends on and what would stop it.
- 1306Dai Viet gets Chau O and Chau Ly (the Hue plain) as the dowry of Princess Huyen Tran; the Hai Van line becomes the border.Depends on: Champa is still a kingdom in 1306. Stopped by: A strong Cham king or a Khmer or Mongol shift.
Places of note
- Bo Chinh: Board's point
- Ba Don: Gianh plain
Where the sources disagree
- Board: 'in a weak reign it is a march rather than a province': agreed; we draw it as a contested march from the Ngang pass to the Thach Han mouth. The Hai Van line of the campaign board's later notes is of 1306, not 1200.
Evidence: The cession of 1069 is certain; the 1200 position rests on the campaign board and on the absence of any later Cham claim dated to the 1190s.
"The campaign board" is OMNIA's working map. These notes record where its earlier claims were checked against the sources.
Sources and studies
- Lý dynasty, English Wikipedia (read)
- OMNIA board notes for the Vietnam and Champa area (a lead, not a source)
Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.