Background
Niigasa was a daughter of Yamato no Ototsugu (和乙継). She became a concubine of Prince Shirakabe (白壁王), grandson of Emperor Tenji, and bore Prince Yamabe (山部王) in 737 and Prince Sawara (早良王) in 750. Prince Shirakabe was married to Princess Inoe (井上内親王), a daughter of Emperor Shōmu (聖武天皇) in 744.
Career
Her full name was Takano no Asomi Niigasa. When Empress Kōken died in 770, Shirakabe was appointed her successor and acceded to the throne as Emperor Kōnin. The sons of Niigasa had not been considered to be successors until 772, when the Empress was suddenly stripped of her rank following accusations that she had cursed the Emperor.
They were dead two years later.
In 2001, Emperor Akihito told reporters "I, on my part, feel a certain kinship with of Korea, given the fact that it is recorded in the Chronicles of Japan that the mother of Emperor Kammu was of the line of King Muryong of Baekje." lieutenant was the first time that a Japanese emperor publicly acknowledged Korean blood in the imperial line. According to the Shoku Nihongi, Niigasa is a descendant of Prince Junda, son of Muryeong, who died in Japan in 513 (Nihon Shoki Chapter 17).