As the Yongli regime was endangered by the encroaching Manchus, the Jesuit Andreas Wolfgang Koffler, who had been at the Yongli court since 1645, had succeeded in converting many of the members of the imperial family to Christianity believing this would attract help from Western monarchs for the Southern Ming's struggle to continue to rule China. Among the Christians at the Yongli's court were Empress dowager Helena Wang (Wang Liena), the wife of the emperor's father; Empress dowager Maria Ma (Ma Maliya), the mother of the emperor; and the heir to the throne, prince Constantine (Dangding), Zhu Cuxuan. The Emperor's eunuch secretary Pang Tianshou (龐天壽), known by his Christian name Achilles, had become a Christian as well, years earlier.