Sources

1) Source: Cosmas of Prague, The Chronicle of the Czechs "In the year of the Lord’s incarnation 1062. On January 27 the Duchess Adelaide died, mother of Judith, Ludmila, and of the younger Břetislav as well as of Vratislav" (Data from secondary evidence)
2) Source: Cosmas of Prague, The Chronicle of the Czechs "Perchance, this king [Andrew of Hungary] had only one daughter by the name of Adelaide, already old enough for the marriage bed and very pretty who aroused jealous hope in many a suitor. On seeing her, the guest fell desperately in love and since the good king did not object, he soon conjoined her in marriage"
3) Source: Cosmas of Prague, The Chronicle of the Czechs "In the year of the Lord’s incarnation 1085. Judith, wife of Władisław, duke of the Poles, who was the daughter of Vratislav, duke of the Czechs, died on December 25" (Data from secondary evidence)
4) Source: Cosmas of Prague, The Chronicle of the Czechs "In the meantime, bad news burst upon our ears — that King Vratislav had departed to Christ on January 14" (Data from secondary evidence)
5) Source: Cosmas of Prague, The Chronicle of the Czechs "In the year of the Lord’s incarnation 1102. Władisław, duke of Poland had two sons: one from a concubine, Zbigniew; another from Judith, the daughter of King Vratislav, called Bolesław; between them he divided his realm in half" (Data from secondary evidence)