Question: Who is the maternal grandfather of Izyaslav Of Polotsk?
Sentence (from "Izyaslav of Polotsk"): Izyaslav died at the young age of about 23, in 1001, surviving his mother but predeceasing his father Vladimir of Kiev, thus excluding his descendants from ever succeeding the Kievan throne, according to the so-called "Rota system".
Relevant evidence: No