Space Viking, by H. Beam Piper, paperback science fiction novel
After the titanic war that had destroyed the galaxy’s Old Federation, every suviving world was on its own – and at the mercy of the Space Vikings!
Lucas Trask was one of these renegades – a powerful warlord commanding a deadly fighting force, hated and feared for his plundering, terrorising ways. But few people realised that behind his savage mask was a mind embittered by grief and loss, and driven by an iron determination. Lucas Trask was a man with an old score to settle. And he would stop at nothing until he had achieved his goal…”