Why did knights have to protect their own land?

Knights had to protect their own land primarily due to the feudal system, where they were granted land (fiefs) by a lord in exchange for military service. This arrangement meant that defending their land was essential to maintaining their status and resources. Additionally, local conflicts and threats from rival lords or invading forces made it necessary for knights to ensure the safety and security of their territories and the people living on them. Ultimately, their loyalty and duty to protect their land were integral to their role and honor as knights.