In Europe, saffron cultivation declined steeply following the Roman Empire's fall. Saffron was reintroduced when the Islamic civilization "Al-Andalus" spread to Spain, France, and Italy. During the 14th century Black Death, there was a huge increase in demand for saffron-based medicine. Much saffron had to be imported by Venetian and Genoan ships from southern and Mediterranean lands such as Rhodes. The theft of one such shipment by noblemen started the 14 week long "Saffron War". The conflict and resulting fear of rampant saffron piracy spurred significant saffron cultivation in Basel, which grew prosperous. Cultivation and trade then spread to Nuremberg, where epidemic levels of saffron adulteration brought on the "Safranschou" code. Under this law under saffron adulterers were fined, imprisoned, and executed. Soon after, saffron cultivation spread throughout England, especially Norfolk and Suffolk. The Essex town of Saffron Walden, named for its new specialty crop, became England's main saffron growing and trading center. However, an influx of more exotic spices such as chocolate, coffee, tea, and vanilla from newly contacted Eastern and overseas countries caused European cultivation and usage of saffron to decline. Only in southern France, Italy, and Spain, did significant cultivation continue.