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Aric of Dacia, aka, X-O Manowar - Held prisoner for seven years after his abduction in the 5th Century Roman Empire, Aric was able to fight his way to the alien armory, where he obtained the control ring for the X-O Manowar armor to escape, but as the alien ship had been traveling at light speed, ended up returning to Earth in the 20th century.
Which superhero was actually a 5th Century Visigoth who, after being kidnapped by aliens, acquired a suit of living armor to escape?