Mieszko II Lambert
She was the eldest daughter of Count Palatine Ezzo of Lotharingia by his wife, Matilda, daughter of Emperor Otto II and Empress Theophanu. She could be even the eldest child of Ezzo and Matilda. Richeza's parents were married in 993, so she could have been born no earlier than 993. Polish historian Kazimierz Jasiński supposed that she was few years younger than her husband Mieszko II Lambert.