> Włodkowic strongly supported the idea of conciliarism and pioneered the notion of peaceful coexistence among nations – a forerunner of modern theories of human rights.
In short Włodkowic argumented at 'International Tribunal' during the 1414 Concil of Constance that Teutonic Order cannot justify it's violence and conquest of neighbours just because they are pagans. That was some years before Columbus..
At that time it was customary for European knights to come as guest to Prussia and take part in military expeditions against pagans as a sort of hunting excercise (razzia).
His book "De Optimo Senatore" was highly influential abroad including Britain. Apparently, parts of his writings were the inspiration for the character of Polonius in Hamlet.
https://en.m.wikipedia.org/wiki/Pawe%C5%82_W%C5%82odkowic