The chained man
is Uquar, who is worshipped in Helen
's world, and whose teachings about the many worlds are considered sacred. He was chained up by Them
, which made it possible for Them
to control all the worlds. Helen mentions that the Hands of Uquar always wear black "in mourning for the terrible fate of Uquar." In the tradition of Our World
, of course, Uquar is clearly Prometheus.