Emphyrio by Jack Vance

Halma is a planet forever shrouded by the mystical epic of Emphyrio. Governed by an antiquated feudal system, all but the powerful Lords are involved in the planet’s arts and crafts handiwork, which is exported and highly regarded throughout the galaxy. Work on machines is punishable by death, and profits are small. From his father Amiante, Ghyl Tarvoke learns that the inequalities of life on Halma can be remedied, and that the answer lies in legend. When Amiante dies a cruel and unjustifiable death, Ghyl begins his quest – to know the true story of Emphyrio.