Under their governance, woodlands were cleared and marshlands made arable, upon which many cities and villages were founded, including Marienburg (Malbork) and Königsberg (Kaliningrad).
Woodlands were cleared. This was under their governance. Marshlands made arable including Marienburg (Malbork) and Königsberg (Kaliningrad). This was upon which many cities and villages were founded. This was under their governance.