Question: why 14 lbs in a stone?
Answer: The Assize of Weights and Measures, a statute of uncertain date from c. 1300, describes stones of 5 merchants' pounds used for glass; stones of 8 lb. ... In 1350 Edward III issued a new statute defining the stone weight, to be used for wool and "other Merchandizes", at 14 pounds, reaffirmed by Henry VII in 1495.