 There was a lot of tension between Duyet and Minh Mạng . Although Gia Long had enlisted European support to claim the throne and allowed missionaries to function in Vietnam in gratitude to Pigneau , he ran a classical Confucian administration . He also expressed dismay at the Catholic condemnation of the traditional ancestral worship , a basic tenet of Vietnamese culture ; Crown Prince Cảnh had been converted by Pigneau and subsequently refused to bow down to his ancestors , instead desecrating a shrine with feces . 
