because
It was the government of Europe for a 1,000 years.
It eliminated the feudal system in Europe. Which gave increased power to the king.
The strengthening of the feudal system
Europe
Feudal lords.
because they had the same feudal systems at the same time
Christianity, specifically Catholicism.
peasant or serf
Feudal warfare
I think but not sure by strong rulers and forming strong trade routes and and by forming a strong army
One thing that can be said about a feudal economic system is that it is more of a barter trade system.