Serfs really don't own anything. Indeed, no one in the Middle Ages really owned anything, everything was contingent on everything else at first. This is why it was called "feudalism". Same as feud, like in, fighting all the time over territory and such. One swore fealty and in return, got to occupy lands and terrorize serfs at will. Once a lord, an old English word for "loaf of bread" got his hot hands on real estate, he would strengthen his defences so he could fight off all comers especially his feudal overlord. Heh.
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