Leszek I the White
Jan Długosz reported that Adelaide was the daughter of Casimir II the Just. It is unknown when she was born. The fact that she never married and became a nun, supports the presumption that at the time of her father's death in 1194 her future had not yet been decided. Her birth date was placed between the late 1170s and early 1180s. By convention among the offspring of Casimir II and Helena of Znojmo she is placed in the fifth place, after Odon (who died in infancy) and before Leszek I the White and Konrad I of Masovia.