阮福映
The peaceful coexistence of Catholicism alongside the classical Confucian system of Vietnam was not to last. Gia Long himself was Confucian in outlook. As Crown Prince Nguyễn Phúc Cảnh had already died, it was assumed that Cảnh's son would succeed Gia Long as emperor, but, in 1816, Nguyễn Phúc Đảm, the son of Gia Long's second wife, was appointed instead. Gia Long chose him for his strong character and his deeply conservative aversion to Westerners, whereas Cảnh's lineage had converted to Catholicism and were reluctant to maintain their Confucian traditions such as ancestor worship.