This book assesses the results of recent metallographic examination of 45 sword blades (mid-2nd century BC to early-16th century) from the territory of what is now Poland. Pre-Roman blades were usually made from one piece of metal of varying quality (better quality items were perhaps imported). Most high quality and complex technology Roman blades were in all probability of Roman provenance, while some low quality one-piece examples may have been made locally. The Migration Period and Early Middle Ages witnessed the greatest diversification of technological solutions. However it is much more difficult to define the provenance of blades based on their technology in these periods. The range of technologies in use strongly decreased in the High and Late Middle Ages.