There's the nobility, who owned the castles, the knights, who worked for them, and the serfs, who were basically slaves.
Feudalism was based on an agreement between three groups of nobles lords and vassals
the three main groups are that you gey(:
The three main groups in science are chemistry,biology and physics.
nincompoop
To narrow it down to three groups, it would be strings, winds, and percussion.
It has three main groups.
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Class Agnatha
There are three main groups: Igneous, Sedimentary, and Metamorphic.
The 3 main groups of seedless vascular plants are: ferns, horsetails and club mosses.
The french
greek