Mszczuj of Skrzynno

[2] He was a knight in the royal household regiment of the King of Poland (cubiculariorum) and bore the Łabędź (Swan) coat of arms.

[2] Długosz reports that Mszczuj was the knight who defeated and killed the Grand Master of the Order, Ulrich von Jungingen, during the Battle of Grunwald.

[2] First, Mszczuj's squire, Jurga, acquired and handed over a valuable reliquary with holy relics that had previously belonged to von Jungingen, as well as the Grand Master's battle cloak.

[4] On 10 September 1410, Mszczuj took part in a follow-up battle against the Teutonic Knights at Koronowo, contributing to the Polish-Lithuanian victory.

In 1412, he was part of the delegation and personal escort of Władysław Jagiełło to the Kingdom of Hungary, where he participated in tournaments and jousts.