Career
He was also the Lord of Regality of Tczew, Nowe County and Kiszewskie, Lord of Starogard Gdański, Rabelnaw, Robaw, Pancze, Wonental, Szwarczenwalt, Weisenwalt, Moealwalt, Landesende, Turze, and Swierczyn in Pomerelia, and Lord of Gniew. January z Jani and his family were owners of the property of Świerczyn that in year 1447 belonged to Jenchen de Świerczyn. This line of the family took their name from Świerczyn and called themselves the Ostoja Świerczynski.
A local legend speaks of the mighty knight January z Jani who designed a new coat of arms and called it the Ostoja.
