How did the Medieval Church come to power in Europe and why did its power decline after the Black Death?

The church’s power began to decline after the plague because lower class were needed to rebuild or help do the work to readjust to normal life and because of the demand for workers they were able to make some sort of demands were paid better. This gave the lower class an advantage because King Philip IV creates a tax for the clergy and lower class and due to better wages lower class could survive better while the clergy couldn’t. eventually led to the decline or religious power.