Chao Inthavong[1] (Lao: ເຈົ້າອິນທະວົງສ໌; Thai: เจ้าอินทวงศ์; died 7 February 1805), or known as his regnal name Xaiya Setthathirath IV,[2] was the 5th king of the Kingdom of Vientiane (r. 1795 to 1805).
In 1778, he was taken as hostage by Siamese together with his siblings, including Nanthasen, Anouvong and Khamwaen.
After the Battle of Rạch Gầm-Xoài Mút, Vietnamese ruler Nguyễn Ánh fled to Bangkok.
In 1800[4] and 1801,[5] when Nguyễn army marched north to attack Tây Sơn dynasty, Inthavong ordered his forces to attack Nghệ An Province, cooperating with Nguyễn forces.
His younger brother Anouvong was appointed the new king by Siamese, and sent back to Vientiane.