If King John wanted to be a ruler he would have to tell the Nobles and Church officials everything that he did. He would also have to respect the common law and traditional rights of the nobles and Church officials.
Where are you going!?
I am going south, where I won't get sick!
Edward I, King John's grandson included more people in the government including plebeians, church officials and nobles. This also included commoners and people of a lower level. These Political changes were one of the ways that led to the decline of Feudalism.
The Bubonic Plague started between 1346 and 1351. The disease started in central Asia and spread through Central Asia, India, Central-east, and Europe. The disease passed through the main trade routes between east and west. This disease left 1/3 of the people in Europe dead at this time.
I like our local masters more than our own king.
As the Bubonic plague was going on, and the peasants didn't want to die so they left their positions to there lord and migrated to a place much safer. Many kings died and nobles leaving there to be an unstable population.
The Hundred Years War started in the era 1337 and 1453. England and France got in a war in France due to land control. The hundred-year war contributed to the decline of Feudalism due to the power of feudal lords to monarchs and commoners.
Before the Hundreds Years war occurred, many English and French peasants felt more loyalty to there local masters that to there own kings, and this caused people to have a new feeling of national unity and patriotism on both sides.