How did the relationship between a lord and his vassals affect that between vassals and the king?

If a lord acted in the service of a king, the lord was considered a vassal of the king. As part of the feudal agreement, the lord promised to protect the vassal and provided the vassal with a plot of land. This land could be passed on to the vassal's heirs, giving the vassal tenure over the land.

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Explanation:

answer placeholder because the system is messed up