Princess Cheonmyeong, was a princess of Silla, one of the Three Kingdoms of Korea, and is notable as the sister of Queen Seondeok of Silla, and reigned as Silla's which number ruler?
Queen Seondeok of Silla Queen Seondeok of Silla (Hangul: 선덕여왕 ] ; 595~610 – 17 February 647) reigned as Queen Regnant of Silla, one of the Three Kingdoms of Korea, from 632 to 647. She was Silla's twenty-seventh ruler, and its first reigning queen. She was the second female sovereign in recorded East Asian history and encouraged a renaissance in thought, literature, and the arts in Silla.
Seong of Balhae Seong of Balhae, (died 794), sometimes called by his birth-name Dae Hwa-yeo, was the 5th ruler of the Balhae. He was the grandson of King Mun, his father being the deceased heir Dae Goeng-rim.