Mạc Cửu (Chinese: 鄚玖; pinyin: Mò Jiǔ, Hán tự: 鄚玖, Vietnamese: Mạc Cửu; Khmer: ម៉ាក គីវ or ម៉ាក គូ; 1655–1736), also spelled Mok Kui, was a Chinese exile who founded the Principality of Hà Tiên and ruled as its first monarch. He played a role in the relations between Cambodia and the Vietnamese Nguyễn court. Cambodia was invaded by Siamese army, Mạc Cửu was captured and taken to Bangkok. He had no chance to come back to Hà Tiên until a civil strife broke out in Siam. A genealogy of his clan is Hà Tiên trấn Hiệp trấn Mạc thị gia phả.