Denarius of Zbigniew, son of Herman

I wonder if I should add the page of Zbigniew's cross denarius, is it even worth it? It would also be nice to hear some interesting facts about his denarius :))

N#139040

Probably this one.

No, this is about Zbigniew, the brother of Bolesław Krzywousty who ruled over Greater Poland, Masovia and Kujawy, Sieciech is a completely different character, and Zbigniew's deceased has a different pattern

An example of Zbigniew's denarius 

half brother and that N# 139040 coin is listed on his wikipedia page. If you have other coins linked to him and sources with info about it, anybody can contribute to numista. https://en.numista.com/catalogue/contributions/pre_nouveau.php

wcn.pl auction says that your photo is from Władysław Herman or I can't spot difference between your photo and https://wcn.pl/archive/179404

Honestly, the topic is even more confusing now :O I need to read more about this and look at this coin more closely.