Question: Who is the paternal grandfather of Tulan Qaghan?
Sentence (from "Tulan Qaghan"): tu-lan k'o-han, Middle Chinese: (Guangyun) , personal name: 阿史那雍虞閭/阿史那雍虞闾, āshǐnà yōngyúlǘ, a-shih-na yung-yü-lü) was the son of Ishbara Qaghan and the seventh qaghan (Khaqan) of the Turkic Khaganate.
Relevant evidence: Yes