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 "Queen Seondeok of Silla"): She was Silla's twenty-seventh ruler, and its first reigning queen.
Relevant evidence: No