Why did the vassals and lesser lords have to provide a greater lord and the king in the feudal system?​

Explanation:

Fedual Society:

Feudalism was a loosely organized system of rule in which powerful local lords divided their landholdings among lesser lords. In exchange, lesser lords, or vassals, pledged service and loyalty to the greater lord.

-   Everyone had a place in feudal society.

-   Below the monarch were the most powerful lords who held the largest fiefs. Each one of these lords had

   vassals in turn had their own vassals.  

-   In many cases, the same man was both vassal and lord - vassal to a more powerful lord above him and lord  

   to a less powerful vassal below him.

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes