In the late Middle Ages, Nowogród was one of the most important towns of this medieval Polish territory. Nur was also part of it until 1526, when the region was a vassal of the Polish crown. Which medieval principality is it?

Question

Accepted Answer

Duchy of Mazovia. The Duchy of Mazovia was a Polish medieval and early-modern territory centred on Warsaw, absorbed into the Kingdom of Poland in 1526. It included Nowogród in the late Middle Ages and Nur remained part of it until that same year.