Question: Who is Gaero Of Baekje's paternal grandfather?
Sentence (from "Biyu of Baekje"): Although Silla was a protectorate of Goguryeo at this time, Silla and Baekje allied themselves against Goguryeo (Naje Dongmaeng Hangul :나제동맹 Hanja :羅濟同盟).
Relevant evidence: No