Roads That Met at the Adriatic
1In the 1300s, Ragusa (today Dubrovnik, in Croatia) was a small walled city-republic on the Adriatic Sea. It had little farmland, so its people lived largely by trade. Ragusan ships sailed to ports around the Mediterranean, and mule caravans carried goods inland to the silver mines of the Balkan hills. Many goods unloaded in its harbor had already traveled thousands of miles along three great networks of trade.
2Silk Road routes ran overland from China through Central Asia. By the 1300s, many caravans ended at trading ports on the Black Sea, such as Tana and Caffa, where Italian merchants bought Chinese silk and shipped it west. Indian Ocean sea lanes linked China, Southeast Asia, India, Arabia and East Africa. Pepper from India usually crossed the ocean to the Red Sea and was carried on to Alexandria, in Egypt, where Mediterranean merchants bought it. Trans-Saharan camel caravans carried West African gold north across the desert to ports such as Tunis, and historians think much of the gold in Mediterranean coins came this way.
3Ideas traveled with the merchants. Muslim traders and teachers helped spread Islam along the Indian Ocean coasts and across the Sahara. In the late 1100s, a merchant's son from Pisa, Italy, named Leonardo, later known as Fibonacci, learned the Hindu-Arabic numerals, including zero, while his father worked in the North African port of Bugia. In 1202 Leonardo published a book that taught Italian merchants to calculate with them.
4Disease traveled too. The Black Death, a plague probably spread by fleas on rats and from person to person, moved west from Central Asia along trade routes. In 1346 it struck Caffa. Within about a year, Italian ships had carried it to Constantinople and to Sicily, and early in 1348 it reached Ragusa. Like many Mediterranean cities, Ragusa lost many of its people, and the plague returned several times in later years.
5In July 1377, Ragusa's Great Council voted on a new rule. Anyone arriving from a place with plague, by sea or by land, had to stay for a month on the small island of Mrkan or in the nearby town of Cavtat before entering Ragusa. Later, Venice and other ports made travelers wait forty days. The Italian word for forty, quaranta, gave English the word quarantine.