Question: 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?
Sentence (from "Princess Cheonmyeong of Silla"): Princess Cheonmyeong (hanja: 天明公主 ) was a princess of Silla, one of the Three Kingdoms of Korea, and is notable as the sister of Queen Seondeok of Silla, who reigned as Silla's twenty-seventh ruler.
Relevant evidence: Yes