Castle of the Masovian Dukes in Ciechanów

Castle of the Masovian Dukes is a Brick Gothic castle built at the turn of the 14th and 15th centuries. It is situated in the town of Ciechanów, Masovian Voivodeship, in Poland. History Initially, it was believed that the castle was founded by Siemowit III in the middle of the 14th century. However, according to dendrochronological tests, the foundations made of wooden stakes date to around 1399. [ 1 ] The castle was erected thereafter with the assistance of Janusz I of Warsaw , Siemowit's son and successor who was Duke of Masovia . Records indicate that a structure was completed in 1429. [ 1 ] The circular towers located in the four corners of the castle's square formation and an additional 10 metre high walls suggested.