a person in a condition of servitude, required to render services to a lord, commonly attached to the lord's land and transferred with it from one owner to another.

a slave.

noun

bondservant , bondsman/woman , chattel , laborer , peon , servant , vassal , villain , villein , bondman , bond servant , churl , colonus , esne , helot , hireling , muzhik , peasant , slave , thrall