The relationship between a feudal lord and vassal is that where the vassal provided loyalty and service and The feudal lord looks after the vassal's well-being.
Feudalism was a social system in medieval Europe, where the nobility held lands from the Crown in exchange for military service.
The nobles had vassals who were tenants, while the peasants (villeins or serfs) were obligated to live on their lord's land and give him homage, labour, and a portion of the produce in exchange for military protection.
In other words, the lord was a noble who held land, a vassal was a person who was granted possession of the land by the lord, was known as a fief.
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