Answer: control of power by hereditary landholding class
Explanation:
Romans came from the Italian pensinsula and came to Britain in the early first century. It was a gradual process and they slowly started conquering the different parts of the British isles during that time.
Vikings came from the Northern parts of Europe and they started conquering the British isles in later periods.
Both came and wanted to conquer the lands, while Romans were 'established' conquerors and started governing these areas soon by spreading their culture etc. The Vikings on the other hand had pillaing more in mind and did more of that and did not govern that much from the beginning.
Explanation:
The purpose of Hay's notes was to grant all the major powers equal access to Chinese trade and reduce the influence of countries that already had an especially large hold in China (such as Japan and Russia) so they couldn't force other countries (particularly the United States) out of the Chinese market.