 Yamtuan Imam left a son, Tunku Ahmad Tunggal who should have inherited the throne.Dato 'Siamang Gagap instead elevated Tuanku Ampuan Intan as a temporary Regent (1869-1872) on the grounds that a temporary successor to Yam Tuan Imam can be decided.As a result, in 1874, fierce warfare between Yamtuan Antah and Tunku Ahmad Tunggal erupted.