sentences:  A small Christian minority also exists among the Hausa.The Hausa were famous throughout the Middle Ages for their cloth weaving and dyeing, cotton goods, leather sandals, metal locks, horse equipment and leather-working and export of such goods throughout the west African region as well as to north Africa (Hausa leather was erroneously known to medieval Europe as Moroccan leather).They were often characterized by their Indigo blue dressing and emblems which earned them the nickname "bluemen".