Wharram Percy/Feudal System – ZUM-Unterrichten https://unterrichten.zum.de/wiki/Wharram_Percy/Feudal_System
The Feudal System was introduced by King William I after the Battle of Hastings in 1066 when he became King of England. William said that he owned all of the land in England having killed many of the Saxon Earls and taken the land from most of the others he had defeated. He gave large estates to the Norman Barons who had supported him at Hastings as a rewards for loyal service and also to keep them on his side in future. It is is now 1196 and Richard is our King, though he has spent years away at the Crusades and fighting in France, and the same system is used today.
This is how Kings since William have raised an army.