Mikołaj Błociszewski

Mikołaj was a son of Świętomir Błociszewski de Błociszewo of the Clan Ostoja.

In 1408, he received permission from Wojciech Jastrzębiec, the bishop of Poznań, to build a church in Błociszewo, although the ownership of the estate of had been lately passed on to his elder brother Jan. Their sister was probably Formosa de Rąbin, who at the turn of the 15th century, sued for payment for her part of the inheritance.

[4][5] Błociszewski was delegated by the Polish King Jagiełło to negotiate a peace treaty with the Teutonic Knights, and with Emperor Sigismund von Luxemburg (Sigismund, Holy Roman Emperor), who mediated between the conflicted parties.

On behalf of Emperor Sigismund, the negotiations where led by Stibor of Stiboricz of the Ostoja clan as well.

The failure of negotiations led to the war with the Teutonic Knights, which culminated at the Battle of Grunwald (1410).