Bolesław IV of Warsaw (1421-1454)
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Bolesław IV of Masovia
![English](/Images/flags/small/gb.png)
Bolesław IV of Warsaw
![English](/Images/flags/small/gb.png)
Bolko IV of Masovia
![English](/Images/flags/small/gb.png)
Bolko IV of Warsaw
![International format](/Images/flags/small/un.png)
Bolesław IV Mazowiecki
![International format](/Images/flags/small/un.png)
Bolesław IV Warszawski
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