In 1013 , the marriage between Bolesław 's son Mieszko and Richeza of Lotharingia , the niece of Emperor Otto III and future mother of Casimir I the Restorer , took place .
Head entity: casimir i the restorer Q53455 25 26 27 28
Tail entity: richeza of lotharingia Q269619 11 12 13
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P25