The golden age of the British monastery was during the medieval period, when monks transformed British society and rose to a position of immense power. Fighting back after centuries of defeat and neglect, a wave of new monasteries spread across the nation, with over 500 British monastic houses established by the 14th century. Far from the inward-looking recluses of legend, monks were exceptionally creative, and became pioneers in the fields of medicine, science, scholarship, industry, farming, art and music. They didn't turn their back on the medieval world, but helped transform it. Yet as the monasteries mingled with the world outside their cloisters they began to take on its corruption

• Janina Ramirez