Who is responsible for the overall development of the media plan when conducting a campaign

though both had similar roots, they both took these similar bases & formed it into their own way. both the byzantine empire and ancient roman have similar aspects, but each one made it unique. both the byzantine empire and ancient romans had roman influences which affected their culture

there is not all the infomation needed to answer this question.   we need the who was going, or we need to know what islands you are talking about.