How the feudal system worked
1. William took all land into his ownership (domain)
2. He granted land to loyal Norman nobles (tenants-in-chief/barons) in return for loyalty and service
3. Tenants-in-chief/barons provided privileges to sub-tenants/knights in return for 40 days of military service per year
4. Knights allowed peasants to live on and farm their land in return for rent, taxes, and labor service