A common standard of spiritual behaviour might be expected by those who gathered under a kings or knights banner. A banner in dreams has this connotation and can also suggest a message to be put across to others. Psychologically we may adopt - or need to adopt - some kind of crusade or special cause. We need to know we have a common cause to fight for which is organized and specific. If the banner in the dream is a commercial one, such as a street, advertising or protest type, it represents the need to have something, which we may previously have ignored or rejected, brought to our attention. If the banner is an old fashioned one - as used in medieval battles - it indicates a need to consolidate thoughts and actions. You might like to consult the entry for Flag for further clarification.