Question: What is the date of death of Soběslav (Died 1004)'s mother?
Sentence (from "Střezislava"): Some historians suppose that she might have been a member of the Přemyslid house (the ruling family in Bohemia at that time), possibly a daughter of Vratislaus I and Drahomíra, or of some historically unknown member of that dynasty.
Relevant evidence: No