Question: What is the date of death of Casimir I The Restorer's father?
Sentence (from "Mieszko II Lambert"): At this time, several Polish territorial acquisitions of his father were lost: Upper Lusatia (also known as "Milsko"), part of Lower Lusatia, Red Ruthenia, western and central part of Upper Hungary (now Slovakia) and probably Moravia.
Mieszko II was very well educated for the period.
Relevant evidence: No