Question: Who is Yujiulü Nagai's paternal grandfather?
Sentence (from "Yujiulü Tuhezhen"): Yujiulü Tuhezhen (pinyin: Yùjiǔlǘ Tǔhèzhēn) was ruler of the Rouran from September 444 to 464 with the title of Chu Khagan (處可汗).
Relevant evidence: No