The Primitive — E.C. Tubb

Leon Vardis' whole life was keyed to revenge.

If it couldn't be wreaked on the peasants who had burned his mother as a witch on the primitive planet of Rhome, then it could, most gloriously could, be let loose on the contemptuous sophisticates who rescued him from certain death, toyed with him for their own amusement and then, uncaring, cast him aside on the metropolitan planet of Joslen.

But first his apprenticeship - as peasant farmer on Pharos, as space mercenary on more planets then you'd care to name. Then independence, as a stellar trader. And at last an opportunity to act as Fate, slowly, and with ironically sophisticated enjoyment, For in the hypnotic jewels of far Shergol lay the seeds of a truly cosmic vengeance.

Leon's saga was complete. The ultimate leveller had been unleashed on the galaxy.