Duchy of Bydgoszcz and Wyszogród[a] was a district principality and a fiefdom within the Kingdom of Poland during the era of fragmentation.

Leszek stayed the ruler of remaining lands of Inowrocław while Przemysł was given Bydgoszcz and Wyszogród.

[2] On 27 June 1315 near Kraków, Przemysł had joined the alliance of Władysław I Łokietek together with Denmark, Sweden, Rügen, Pomerania-Stettin, Pomerania-Wolgast and Mecklenburg, against the Margraviate of Brandenburg.

On 11 June 1318, Leszek and Przemysł had signed the survival agreement, according to which, after the death of one of them, the other was going to inherit their territories.

[1][2] In 1323, Leszek had abdicated and left Kuyiavia, with Przemysł succeeding his throne and uniting his both states into Duchy of Inowrocław.