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The cutting-edge papers in this collection reflect the wide areas to which John Pryor has made significant contributions in the course of his scholarly career. They are written by some of the world's most distinguished practitioners in the fields of Crusading history and the maritime history of the medieval Mediterranean. His colleagues, students and friends discuss questions including ship construction in the fourth and fifteenth centuries, navigation and harbourage in the eastern Mediterranean, trade in Fatimid Egypt and along the Iberian Peninsula, military and social issues arising among the crusaders during field campaigns, and wider aspects of medieval warfare. All those with an interest in any of these subjects, whether students or specialists, will need to consult this book.

The Mediterranean Sea is a marine biodiversity hot spot. Here we combined an extensive literature analysis with expert opinions to update publicly available estimates of major taxa in this marine ecosystem and to revise and update several species lists. We also assessed overall spatial and temporal patterns of species diversity and identified major changes and threats. Our results listed approximately 17,000 marine species occurring in the Mediterranean Sea. However, our estimates of marine diversity are still incomplete as yet-undescribed species will be added in the future. Diversity for microbes is substantially underestimated, and the deep-sea areas and portions of the southern and eastern region are still poorly known. In addition, the invasion of alien species is a crucial factor that will continue to change the biodiversity of the Mediterranean, mainly in its eastern basin that can spread rapidly northwards and westwards due to the warming of the Mediterranean Sea. Spatial patterns showed a general decrease in biodiversity from northwestern to southeastern regions following a gradient of production, with some exceptions and caution due to gaps in our knowledge of the biota along the southern and eastern rims. Biodiversity was also generally higher in coastal areas and continental shelves, and decreases with depth. Temporal trends indicated that overexploitation and habitat loss have been the main human drivers of historical changes in biodiversity. At present, habitat loss and degradation, followed by fishing impacts, pollution, climate change, eutrophication, and the establishment of alien species are the most important threats and affect the greatest number of taxonomic groups. All these impacts are expected to grow in importance in the future, especially climate change and habitat degradation. The spatial identification of hot spots highlighted the ecological importance of most of the western Mediterranean shelves (and in particular, the Strait of Gibraltar and the adjacent Alboran Sea), western African coast, the Adriatic, and the Aegean Sea, which show high concentrations of endangered, threatened, or vulnerable species. The Levantine Basin, severely impacted by the invasion of species, is endangered as well. This abstract has been translated to other languages (File S1).

The cutting-edge papers in this collection reflect the wide areas to which John Pryor has made significant contributions in the course of his scholarly career. They are written by some of the world's most distinguished practitioners in the fields of Crusading history and the maritime history of the medieval Mediterranean. His colleagues, students and friends discuss questions including ship construction in the fourth and fifteenth centuries, navigation and harbourage in the eastern Mediterranean, trade in Fatimid Egypt and along the Iberian Peninsula, military and social issues arising among the crusaders during field campaigns, and wider aspects of medieval warfare. All those with an interest in any of these subjects, whether students or specialists, will need to consult this book.

The Mediterranean Sea is a marine biodiversity hot spot. Here we combined an extensive literature analysis with expert opinions to update publicly available estimates of major taxa in this marine ecosystem and to revise and update several species lists. We also assessed overall spatial and temporal patterns of species diversity and identified major changes and threats. Our results listed approximately 17,000 marine species occurring in the Mediterranean Sea. However, our estimates of marine diversity are still incomplete as yet-undescribed species will be added in the future. Diversity for microbes is substantially underestimated, and the deep-sea areas and portions of the southern and eastern region are still poorly known. In addition, the invasion of alien species is a crucial factor that will continue to change the biodiversity of the Mediterranean, mainly in its eastern basin that can spread rapidly northwards and westwards due to the warming of the Mediterranean Sea. Spatial patterns showed a general decrease in biodiversity from northwestern to southeastern regions following a gradient of production, with some exceptions and caution due to gaps in our knowledge of the biota along the southern and eastern rims. Biodiversity was also generally higher in coastal areas and continental shelves, and decreases with depth. Temporal trends indicated that overexploitation and habitat loss have been the main human drivers of historical changes in biodiversity. At present, habitat loss and degradation, followed by fishing impacts, pollution, climate change, eutrophication, and the establishment of alien species are the most important threats and affect the greatest number of taxonomic groups. All these impacts are expected to grow in importance in the future, especially climate change and habitat degradation. The spatial identification of hot spots highlighted the ecological importance of most of the western Mediterranean shelves (and in particular, the Strait of Gibraltar and the adjacent Alboran Sea), western African coast, the Adriatic, and the Aegean Sea, which show high concentrations of endangered, threatened, or vulnerable species. The Levantine Basin, severely impacted by the invasion of species, is endangered as well.

The Mediterranean Sea is a marine biodiversity hot spot. Here we combined an extensive literature analysis with expert opinions to update publicly available estimates of major taxa in this marine ecosystem and to revise and update several species lists. We also assessed overall spatial and temporal patterns of species diversity and identified major changes and threats. Our results listed approximately 17,000 marine species occurring in the Mediterranean Sea. However, our estimates of marine diversity are still incomplete as yet-undescribed species will be added in the future. Diversity for microbes is substantially underestimated, and the deep-sea areas and portions of the southern and eastern region are still poorly known. In addition, the invasion of alien species is a crucial factor that will continue to change the biodiversity of the Mediterranean, mainly in its eastern basin that can spread rapidly northwards and westwards due to the warming of the Mediterranean Sea. Spatial patterns showed a general decrease in biodiversity from northwestern to southeastern regions following a gradient of production, with some exceptions and caution due to gaps in our knowledge of the biota along the southern and eastern rims. Biodiversity was also generally higher in coastal areas and continental shelves, and decreases with depth. Temporal trends indicated that overexploitation and habitat loss have been the main human drivers of historical changes in biodiversity. At present, habitat loss and degradation, followed by fishing impacts, pollution, climate change, eutrophication, and the establishment of alien species are the most important threats and affect the greatest number of taxonomic groups. All these impacts are expected to grow in importance in the future, especially climate change and habitat degradation. The spatial identification of hot spots highlighted the ecological importance of most of the western Mediterranean shelves (and in particular, the Strait of Gibraltar and the adjacent Alboran Sea), western African coast, the Adriatic, and the Aegean Sea, which show high concentrations of endangered, threatened, or vulnerable species. The Levantine Basin, severely impacted by the invasion of species, is endangered as well.

The chapter presents the nautical technology of Mediterranean ships from prehistory through to the modern period. The emphasis is on hull design and the steering and propulsion systems. The chapter addresses the following questions: was ship design the product of mere technological invention or the result of economic or political environments that induced technological solutions? How did nautical technology contribute to seafaring capabilities and to spatial and horizon shrinkage in the Mediterranean and beyond? What were the by‐products of this evolution in nautical technology?

The Fatimids were an imperial power of worldwide interests and broad horizons. The Fatimids actively sought information about foreign countries and people, and the sources provide a clue as to how Fatimid maps might have been commissioned. The Fatimids were a Mediterranean imperial power with an interest in and knowledge of the countries found around its shores, but its geography and history as exemplified by the paradigms put forward by Fernand Braudel, or the perceptions of the Mediterranean as a Corrupting Sea or as an Enriching Sea, had any relevance to them. A further discussion of twelfth-century Fatimid Mediterranean trade will focus on the shopping list of the vizier Mamun al-Bataihi, which reveals Fatimid trade policies and practices. Although the Fatimids established themselves on the ruins of the Aghlabid emirate of Tunisia, their political ambitions were of a much broader scope. However, within the context of the Fatimid relations with Europe, the concession granted to Amalfi was rather unusual.