It must have been magnificent to see: a vast world map made of pure silver. For three centuries no better map was made. The glittering silver original graced the Palermo court of Roger II, the Italo-Norman King of Sicily and Southern Italy. It was made for him by his scholar geographer friend Muhammad Al Idrisi. The map represented one of the most ambitious scientific undertakings of its day taking more than 15 years to complete. It was imagined by a king famed for his learning at the height of his kingdom’s powers. It took almost 150 kilograms of silver to make and showed the world in 7 climates. To make…