李聖宗
On 25th of the first month in 1066, Lady Ỷ Lan gave birth to Lý Càn Đức, the first child of Lý Thánh Tông. Right after the birth, Lý Càn Đức was entitled crown prince of the Lý Dynasty while Lady Ỷ Lan was granted the title Imperial Concubine (Nguyên phi or Thần phi). To celebrate the event that lifted the emperor's constraint of dying without issue, Lý Thánh Tông changed his era name from Chương Thánh Gia Khánh (彰聖嘉慶) to Long Chương Thiên Tự (龍章天嗣) and gave out a general amnesty for prisoners. In the second month of 1068, Ỷ Lan had a second son who was later entitled Prince Minh Nhân (Minh Nhân vương).