Question: Who is the paternal grandfather of Shahriyar (Son Of Khosrow Ii)?
Sentence (from "Khosrow II"): Following the failure of the siege, Heraclius started a counterattack, undoing all territorial gains by Khosrow in the Levant, most of Anatolia, the western Caucasus, and Egypt, eventually marching into the Sassanian capital of Ctesiphon.
Relevant evidence: No