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It was established in 1353 together with the adjacent Augustinians cloister and a hospital of the Holy Spirit intra muros by Siemowit III duke of Masovia and his wife Eufemia.
At first it was part of another Polish fiefdom, the Duchy of Masovia, as in 1388 the king of Poland, Władysław Jagiełło, granted Belz to Siemowit IV, Duke of Masovia, for his recognition of Masovia as a fiefdom of Poland and as a dowry for Siemowit's marriage with Jagiełło's sister, Alexandra.
Most notable was Heinrich von Plötzke, while born a Duke of Masovia, did not use the title and became a major officer (including Komtur) of the Knights.