Here is an excellent re-print of the John Pryor's book which brings together an imposing mass of data related to the shipping in Mediterranean Sea of the medieval times. This study will be found very useful for all people seriously interested in the early modern history of that area. The book focuses on oceanographic and meteorological conditions in the Mediterranean, it shows all limitations faced by the oar and sailing vessels over a thousand years ago and explains how those limitations impacted on naval warfare and piracy and influenced sea trade and travel. The content of the book is very easy-to-read and well-written bringing together a huge amount of useful information relating to the maritime shipping in the medieval Mediterranean sea. The publication contains the results of the very serious study conducted with the intention to fill in the existing information gaps and provide interested people with a complete panorama. This book presents a very powerful example of how useful it can be to make careful studies of both geographical and technical influences. The publication considers the relevant technological limitations of the shipping traffic in conjunction with the specific geographical conditions within which vessels were operating and description of how those conditions led to establishing of the important sea lanes of safe and effective shipping.