Hedwig of Masovia (Polish: Jadwiga mazowiecka, Hungarian: Hedvig mazóviai hercegnő; ca.
On 3 January 1410, Hedwig married the Hungarian magnate John Garai, Ban of Ozora and ispán of Temes and Požega Counties.
Hedwig's father Siemowit IV, during the Polish-Teutonic War wanted to be close to the Hungarian King Sigismund of Luxembourg, who at that point was an undercover ally of the Teutonic Order.
In 1435, the Hungarian Diet began a process against Hedwig, who was accused of poisoning her husband, feared that he could discover her affair with one of his relatives, Nicholas Szécsényi.
She spent rest of her life in house arrest in good living conditions in the fort of Ladislaus Garai.