Question: Who is the paternal grandfather of Ostromir?
Sentence (from "Konstantin Dobrynich"): In 1018, he is said to have destroyed the boats which Yaroslav intended to use for fleeing to Scandinavia from his brother Svyatopolk I. Konstantin persuaded Yaroslav to continue his war against Svyatopolk, helped him muster a new druzhina and regain the Kievan throne.
Relevant evidence: No