Post-Longvek Khmer kingdom that relocated its capital to Oudong under King Chey Chettha II; the era's most vulnerable centuries, squeezed between expanding Ayutthaya (Siam) to the west and the Vietnamese Nguyen lords to the east, who progressively absorbed the Mekong Delta.
King Norodom signed the French protectorate agreement on 11 August 1863, ending Cambodian independence and beginning the colonial period.
The atlas holds 4 border frames for Kingdom of Cambodia (Oudong period) — the shape you scrub through changes in 1618 · 1717 · 1792 · 1808.
Same verified fallback already cited on the existing 'cambodia' and 'cambodia_longvek' canonical records — no dedicated English-language Oudong-period-only monograph found on Open Library. Chandler's standard scholarly history covers the Oudong period as a distinct chapter.