李聖宗
In the second month of 1069, Lý Thánh Tông personally led a military campaign against the kingdom of Champa and left the regentship for Ỷ Lan. Ngô Sĩ Liên in "Đại Việt sử ký toàn thư" recounted that after an unsuccessful period of attack, the emperor wanted to abandon the campaign but in hearing the stability of the country under the regency of the imperial concubine, Lý Thánh Tông continued to carry on his campaign, finally he was able to capture the king of Champa Rudravarman IV and fifty thousand people of Champa. During that time, Ỷ Lan accomplished her regentship by bringing the harmony to Đại Việt people and propagating Buddhism in the country, therefore Ỷ Lan was called by the name "Quan Âm".