Whaur reliable foondation dates exist, airticles should be categorised bi year for 1500 an later, bi decade frae the 1300s tae the 1490s, bi century frae the 10th century BC tae the 13t century an bi millennium for the 2nt millennium BC an earlier. Prior tae 1500, whaur greater datin accuracy exists, airticles should an aa be placed in the appropriate Establishments bi year category.