In the fifteenth century, a Venetian mariner, Michael of Rhodes, wrote and illustrated a text describing his experiences in the Venetian merchant and military fleets. He included a treatise on commercial mathematics and treatments of contemporary shipbuilding practices, navigation, calendrical systems, and astrological ideas. This manuscript, "lost," or at least in unknown hands for over 400 years, has never been published or translated in its entirety until now. In volume 3, nine experts, including the editors, discuss the manuscript, its historical context, and its scholarly importance. Their essays examine the Venetian maritime world of the fifteenth century, Michael's life, the discovery of the manuscript, the mathematics in the book, the use of illustration, the navigational directions, Michael's knowledge of shipbuilding in the Venetian context, and the manuscript’s extensive calendrical material. The book of Michael of Rhodes, a Greek by birth who integrated within Venetian society, is a unique document. It offers an exceptionally precious insight into the life, interests, and knowledge of a mariner whose career in the Venetian navy, on state missions and commercial expeditions extended from 1401 to 1443. In his numerous sailings between Venice, England, Egypt, and the Black Sea he gathered extensive data about shipbuilding, navigation, time reckoning, ports, maritime transportation, commodities, trade, and commercial calculation. This book will appeal to scholars of economic, maritime, and cultural history of the late Middle Ages.