Yes or No, could relearned classical knowledge about citizenship, brought back by the
crusaders, have anything to do with these new demands

Yes, the knowledge of classics changed the way the crusaders viewed the world.

Explanation:

In many ways the crusades were responsible for some of the bigger changes in Europe indirectly than previously imagined and it is often overlooked that they were the ones that brought the European classics back to Europe in the alter crusades.

Europe had already built its society on Greek and Roman influence but had also lost their knowledge.

This rediscovery made it so that there was a revival and there was an ostensible interest in getting those better times back into the fold of the new world.

an era of negotiation.

is that an answer to your question?

i also think it is c