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A thrall is a slave, whether someone in physical, mental, financial or even emotional slavery. The term originated in the Norse culture of old Earth, in the region of northern Europe once home to the Vikings. In its original context to be a thrall meant to be a slave or at best a serf, one who toiled exclusively for the benefit of a ruling class and who lived or died at their whim.
A wikipedia link should suffice. --Alan (talk) 03:06, October 25, 2018 (UTC)