Why do knights protect the king?

Knights protect the king primarily due to their feudal obligations and loyalty. In the hierarchical structure of medieval society, knights swore allegiance to their sovereign, pledging to defend the kingdom and its ruler in exchange for land and titles. This bond of loyalty was crucial for maintaining order and stability, as the king's authority was often challenged by rival factions. Additionally, the king's protection ensured the safety of the realm, which ultimately benefited the knights and their own interests.