In 1306, when she was married to Charles Robert, contemporary Canon Law established that the minimal age for marriage must be at least 12 years old; thus, she was born in 1294 at the latest.

[6] Information about the wedding of Maria and Charles I Robert of Hungary was shown in the chronicle of Jan Długosz, who reported two different dates for this event: 1306 and 1310.

Finally, it's anticipated that the loan 140 pieces of fine silver dragged around 1305 by Casimir of Bytom were used to cover the costs of the wedding of Maria and Charles I Robert.

[10][11] The marriage was probably on the initiative of Władysław I the Elbow-high (first-cousin of Maria's father[12]), and the role of matchmaker was played by her brother Bolesław, then Scholastic of Kraków and Duke of Toszek.

[15] The position of Maria as Queen of Hungary also paved the way for the subsequent career in the Hungarian church of his brothers Bolesław (later Archbishop of Esztergom) and Mieszko (later Bishop of Nitra and Veszprém).

Maria died on 15 December 1317[16] in Temesvár (now Timișoara, Romania) and was buried in the Royal vault of Székesfehérvár[17] in the Basilica of the Virgin Mary, according to the reports of Jan Długosz.

The resulting differences about the date in documents in charters could be explained as a mistake of the writer, who didn't place correctly the last number – rather than MCCCXVII he wrote MCCCXV and MCCCXVI.